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4000 IELTS Academic Words List (9)

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ideal
identical
identification
identify
identity
idiom
idiomatic
idiot
idle
idol
ignite
ignorance
ignorant
ignore
illegible
illiterate
illuminate
illusion
illusive
illustrate
illustration
image
imaginary
imitate
imitation
immediate
immediately
immense
immerse
immigrant
immigrate
immigration
imminent
immoral
immortal
impact
impart
impartial
imperative
implement
implication
implore
imply
import
impose
impractical
impressive
imprisonment
impulse
inability
inaccessible
inadequate
inaugurate
incense
incentive
incident
incidentally
inclination
incline
inclined
inclusive
income
incompatible
inconsistency
inconvenient
incorporate
incredible
incredulous
increment
incur
indebted
indefinite
indefinitely
indent
independent
index
indicate
indicative
indifference
indifferent
indigestion
indignant
indignation
indispensable
individual
induce
inducement
indulge
industrial
industrialization
industrialized
industrious
inertia
inevitable
inevitably
infant
infantry
infect
infection
infectious
infer
inference
inferior
inferiority
infinite
infinity
inflation
inflict
influence
influential
influenza
inform
informal
informative
infringe
ingenious
ingenuity
inhabit
inhabitant
inherent
inherit
initial
initially
initiate
initiative
inject
injure
injury
injustice
inland
innocent
innovate
innovation
innumerable
inquire
inquiry
insane
insert
insider
insight
insignificant
insist
insolvent
inspect
inspection
inspector
inspiration
inspire
install
installation
installment
instance
instinct
instinctive
institute
institution
instruct
instruction
instructive
instrument
instrumental
insufficient
insulate
insulation
insult
insurance
insure
intangible
integral
integrate
integrity
intellect
intellectual
intelligence
intelligent
intense
intensive
intent
intention
interact
interaction
interest
interfere
interference
interior
intermediate
internal
interpret
interpretation
interrupt
interval
intervene
intimate
intrude
inundate
invade
invader
invalid
invalidate
invaluable
invariably
invasion
inverse
invest
investigate
investigation
invisible
invoice
involve
irony
irregular
irresistible
irrespective
irrevocable
irrigate
irrigation
irritate
isolate
isolation
issue
item
ivory


ideal: Read
a.
(理想的,完美的,空想的) existing in idea or thought; conception; intellectual; mental; imaginary standard of excellence; fit for a model; faultless

identical: Read
a. Syn. duplicate; alike
(同一的,完全相同的) duplicate; alike; being the exact same one

identification: Read
n.
(辨认,鉴定) act of designating or identifying something; condition of having your identity established

identify: Read
v. Syn. detect; spot; find out; discover
(识别,认出,鉴定) detect; find out; discover

identity: Read
n. Syn. individuality; character
(身份) exact sameness; distinct personality of an individual regarded as a persisting entity

idiom: Read
n. Syn. lingo
(习语,成语) expression whose meaning differs from meanings of its individual words; distinctive style

idiomatic: Read
a.
(惯用的,通顺的) having the nature of an idiom; characteristic of a given language

idiot: Read
n.
(愚蠢的人,白痴) foolish or stupid person; unlearned, ignorant, or simple person

idle: Read
a.
(不做事的,懒惰的浪费光阴) useless; vain; trifling; unprofitable; thoughtless; given rest and ease; avoiding work or employment; lazy

idol: Read
n.
(神像,偶像) image used for worship; image of divinity; representation or symbol; false notion or conception

ignite: Read
v. Syn. kindle
(点燃) kindle; cause to start burning; set fire to

ignorance: Read
n.
(无知,不了解) lack of knowledge or education

ignorant: Read
a. Syn. unlearned; uneducated; unaware
(无知的,不了解的) lacking education or knowledge; unaware

ignore: Read
v. Syn. disregard; overlook; neglect
(忽视,不顾,不理会) refuse to pay attention to; disregard; overlook; neglect

illegible: Read
a.
(难辨认的,字迹模糊的) incapable of being read; unclear; not legible

illiterate: Read
a.
(不识字的,没受教育的) uncultured; uneducated; not able to read or write

illuminate: Read
v. Syn. brighten; enlighten; clarify
(照亮,明朗,澄清) provide or brighten with light; clear up or make understandable; enlighten

illusion: Read
n. Syn. misconception
(幻觉) misleading vision; being deceived by a false perception or belief

illusive: Read
a. Syn. deceptive; misleading
(迷惑人的,错觉的) deceptive; misleading; based on or having the nature of an illusion

illustrate: Read
v. Syn. represent; demonstrate; depict
((用图或例子)说明,阐明) represent; demonstrate; depict; clarify, as by use of examples or comparisons

illustration: Read
n. Syn. picture; drawing
(例证,插图) picture; drawing; showing by example

image: Read
n. Syn. picture; figure
(图像,肖像,形象) visual representation; representation of a person

imaginary: Read
a. Syn. unreal; fanciful; visionary
(想象中的,虚构的) having existence only in the imagination; fanciful; visionary

imitate: Read
v. Syn. mimic; emulate; copy
(仿效,模仿) copy the actions, appearance, mannerisms, or speech of; mimic; use or follow as a model

imitation: Read
n. Syn. emulation
(模仿,仿制品) emulation; copying the actions of someone else

immediate: Read
a. Syn. prompt; instantaneous; close
(立即的,(在时空上,关系上)最接近的,目前的) not deferred by an interval of time; present; occurring at once; instant

immediately: Read
ad. Syn. right; directly
(立即,马上) proximately; directly; without interval of time; without delay; promptly; instantly; at once

immense: Read
a. Syn. enormous; colossal; boundless
(巨大的,无边的) enormous; boundless; so great as to be beyond measurement

immerse: Read
v.
(浸入,沉浸于) plunge into anything, especially a fluid; sink; dip

immigrant: Read
n. Syn. alien
((自外国移入)移民) one who comes to a country where they were not born in order to settle there; non-native

immigrate: Read
v.
(移居入境) move into another country to stay there permanently

immigration: Read
n.
(外来的移民,移居入境) migration into a place; moving into a place

imminent: Read
a. Syn. impending
(即将到来,逼近的) near at hand; close in time; about to occur

immoral: Read
a.
(不道德的,淫荡的) not moral; contrary to conscience or the divine law; wicked; unjust; dishonest

immortal: Read
a.
(不朽的,流芳百世的) not mortal; exempt from liability to die; undying; imperishable; lasting forever

impact: Read
n. Syn. influence; effect
(影响) forceful consequence; strong effect; influencing strongly

impart: Read
v. Syn. grant; bestow
(赋予,告诉) reveal or tell; grant a share of; bestow

impartial: Read
a. Syn. fair
(公平的) not biased; fair; showing lack of favoritism

imperative: Read
n. Syn. urgent
(及其重要,及其关键) having power command or control; critically importance; some duty that is essential and urgent

implement: Read
v. Syn. execute; perform
(贯彻,实现,用工具实现) put into effect; supply with tools

implication: Read
n. Syn. suggestion; hint
(含义,暗示) something hinted at or suggested; act of implying; condition of being implied

implore: Read
v. Syn. beg; beseech
(恳求) beg for urgently; make an earnest appeal

imply: Read
v. Syn. signify
(暗示,表示) express or indicate indirectly; signify

import: Read
v.
((贸易)进口) bring in from another country

impose: Read
v. Syn. demand; force; inflict
(强加于,施加影响) demand; force; compel to behave in a certain way

impractical: Read
a.
(不切实际的) unwise to implement or maintain in practice; theoretical

impressive: Read
a. Syn. imposing; grand
(给人深刻印象的,威严的) making a strong or vivid impression; producing a strong effect

imprisonment: Read
n. Syn. confinement; incarceration
(监禁) confinement; putting someone in prison or in jail as lawful punishment

impulse: Read
n.
(推动,刺激,冲动) act of applying force suddenly; an impelling force or strength

inability: Read
n.
(无能,无力) lack of ability, especially mental ability, to do something

inaccessible: Read
a. Syn. unreachable; unattainable
(难达到的,不可及的;不能得到的) unreachable; not available; unattainable

inadequate: Read
a. Syn. deficient; insufficient; poor
(不充分的,不适当的) not sufficient to meet a need; insufficient; poor

inaugurate: Read
v. Syn. start; initiate
(开始,开幕,开幕式) start; initiate; induct into office by formal ceremony

incense: Read
v. Syn. enrage; infuriate
(激怒) enrage; infuriate; cause to be extremely angry

incentive: Read
n. Syn. spur; motive
(刺激,驱动) something, such as the fear of punishment or the expectation of reward

incident: Read
n. Syn. occurrence; event; happening
(事件) usually minor event or condition that is subordinate to another; event; happening

incidentally: Read
ad. Syn. by chance; accidentally
(附带地,偶然地) by chance; accidentally

inclination: Read
n. Syn. preference; tendency
(倾斜,弯曲,倾度,倾向,爱好) preference; tendency; inclined surface; slope

incline: Read
n. Syn. slope; slant
(倾斜,斜面) cause to lean, slant, or slope; deviate from the horizontal or vertical

inclined: Read
a. Syn. sloping; slanted
(倾向,倾向于,弯曲) tending or leaning toward; bent; having preference or tendency

inclusive: Read
a. Syn. comprehensive
(包揽一切的) tending to include all; taking a great deal or everything within its scope

income: Read
n.
(收入,所得(工资等)) gain from labor, business, property, or capital

incompatible: Read
a. Syn. inharmonious; incongruous
(不和谐,不兼容) inharmonious; impossible to coexist; not easy to combine harmoniously

inconsistency: Read
n.
(不一致的,自相矛盾的) state of being self-contradictory; lack of uniformity or steadiness

inconvenient: Read
a.
(不便的,有困难的) not suited to your comfort, purpose or needs

incorporate: Read
v. Syn. combine; unite
(合并,联合) combine something into a larger whole; unite

incredible: Read
a. Syn. unbelievable; fabulous
(难以置信的,惊人的) unbelievable; beyond belief or understanding

incredulous: Read
a. Syn. skeptical
(怀疑的) difficult to believe; incredible; skeptical

increment: Read
n. Syn. increase
(增加) process of increasing in number, size, quantity, or extent

incur: Read
v. Syn. cause; arouse
(招致) bring upon oneself; become liable to; acquire or come into

indebted: Read
a.
(感激的,感恩的) morally, socially, or legally obligated to another; under a legal obligation to someone

indefinite: Read
a. Syn. unclear; vague; uncertain
(模糊的,不明确的) unclear; vague; lacking precise limits

indefinitely: Read
ad. Syn. endlessly; incessantly
(不确定地,无穷尽地) endlessly; incessantly; for a long time, no end defined; forever

indent: Read
v. Syn. nick
(使成锯齿状,缩进排印,缩进书写,犬牙交错) nick; set in from margin; impress or stamp

independent: Read
a.
(独立自主的,不受约束的) not dependent; free; not subject to control by others; not relying on others

index: Read
n.
(索引,表征,标记,指数) anything which shows, indicates, manifests, or discloses; prologue indicating what follows; second digit

indicate: Read
v. Syn. show; reflect; evidence; imply; suggest
(指示,指出,象征,表明) point out; direct to a knowledge of

indicative: Read
a. Syn. suggestive; implying
(预示的) suggestive; implying; serving to indicate

indifference: Read
n. Syn. apathy; unconcern; disinterest
(冷漠,不关心) unconcern; disinterest; lack of enthusiasm

indifferent: Read
a. Syn. apathetic; average
(普通的,无关紧要的) having no particular interest or concern; being neither good nor bad

indigestion: Read
n. Syn. dyspepsia
(消化不良) a disorder of digestive function; difficulty in digesting

indignant: Read
a.
(愤慨的,愤愤不平的) affected with indignation; wrathful; passionate; irate; feeling wrath by unworthy or unjust treatment

indignation: Read
n. Syn. anger
(义愤,愤慨) anger aroused by something unjust

indispensable: Read
a. Syn. essential; requisite
(不可缺少的,必需的) essential; requisite; impossible to be omitted or remitted

individual: Read
n.
(单独的,特殊的,个人,个体) single person or thing; human regarded as a unique personality

induce: Read
v. Syn. persuade
(劝诱,导致,引起) persuade; bring about; reason or establish by induction

inducement: Read
n.
(引诱物) something that helps bring about an action or a desired result; an incentive

indulge: Read
v.
(放任,沉溺,使满足) be complacent toward; give way to; not to oppose or restrain; yield to the desire of

industrial: Read
a.
(工业的) of or relating to or resulting from industry; having highly developed industries

industrialization: Read
n.
(工业化) development of industry on an extensive scale

industrialized: Read
v.
(工业化的) made industrial; converted to industrialism

industrious: Read
a. Syn. diligent
(勤奋的,努力的) diligent; hard-working; busy and laborious

inertia: Read
n.
(惰性,懒惰) property of matter by which it tends when at rest to remain so, and when in motion to continue in motion, and in the same straight line or direction

inevitable: Read
a. Syn. unavoidable
(不可避免地) unavoidable; incapable of being avoided or prevented

inevitably: Read
ad. Syn. unavoidably; inescapably
(不可避免地,必然地) unavoidably; in a manner that is impossible to avoid or prevent

infant: Read
n.
(婴儿,幼儿) child in the first period of life; young babe

infantry: Read
n.
(步兵) body of children; a body of soldiers serving on foot; foot soldiers

infect: Read
v.
(传染,使感染,污染,感染,影响) bring into contact with a substance that can cause illness

infection: Read
n.
(传染(病)) moral corruption or contamination; invasion of body which can lead to tissue damage and disease

infectious: Read
a.
(通过空气传染的,有传染性的) contagious; contaminating

infer: Read
v. Syn. deduce; conclude
(推导,总结) deduce; conclude from evidence or premises; lead to as a consequence or conclusion

inference: Read
n.
(推论,推断,推断的结果,结论) inferring by deduction or induction; truth or proposition drawn from another which is admitted or supposed to be true; conclusion; deduction

inferior: Read
a. Syn. poor; lower
((等级,社会地位,质量等)差的,低的) poor; lower than a given reference point; low or lower in order, degree, or rank

inferiority: Read
n.
(自卑感) state of being lower than or not as good as

infinite: Read
a.
(无限的,无穷的,极大的) unlimited or boundless, in time or space; without limit in power, capacity, knowledge, or excellence

infinity: Read
n.
(无限的时间或空间) unlimited extent of time, space, or quantity; eternity; boundlessness; immensity

inflation: Read
n.
(通货膨胀) general increase in the prices of goods and services in a country

inflict: Read
v. Syn. impose; cause
(造成,遭受(痛苦,损伤)) impose something unpleasant; cause

influence: Read
n.
(影响力,感化力) power affecting person or thing; effect of one thing on another; flowing in or upon; influx

influential: Read
a. Syn. important; powerful; significant
(有影响的,有权势的) important; powerful; having or exercising influence or power

influenza: Read
n.
(流行性感冒) an acute febrile highly contagious viral disease

inform: Read
v.
(通知,告诉,(向警方)告发) impart information to; make aware of something; be a pervasive presence in; animate

informal: Read
a. Syn. casual
(非正式的,不拘礼节的) absence of ceremony; casual

informative: Read
a. Syn. instructive; illustrative
(提供消息的,见闻广博的) instructive; illustrative; providing or conveying information

infringe: Read
v.
(违反,侵害) act contrary to, as a law, right, or obligation; annul or hinder

ingenious: Read
a. Syn. clever; resourceful
(聪明的) clever; having inventive or cunning mind

ingenuity: Read
n.
(巧思,聪敏) quality or power of ready invention; quickness or acuteness in forming new combinations

inhabit: Read
v.
(居住) live in; occupy; reside in

inhabitant: Read
n. Syn. resident; occupant
(居民,住户) resident; someone or thing who lives in a place

inherent: Read
a. Syn. intrinsic; natural
(固有的,内在的,与生俱来的) firmly established by nature or habit

inherit: Read
v. Syn. receive
(继承) receive from an ancestor by legal succession or will; receive by bequest or as a legacy

initial: Read
a. Syn. preliminary
(最初的,初始的) early; preliminary; occurring at the beginning

initially: Read
ad.
(最初,开头) in the beginning; at first

initiate: Read
v. Syn. begin; originate
(开始,发源) begin; originate; admit into membership

initiative: Read
n.
(主动,首创精神) serving to initiate; introductory step or movement; act which originates or begins

inject: Read
v. Syn. put in; infuse
(注射,注入,灌溉) put in; infuse ; force or drive fluid into something

injure: Read
v.
(伤害,刺伤(感情)) do harm to; inflict damage; do injustice to

injury: Read
n.
(伤害,侮辱) any physical damage to body caused by violence or accident or fracture

injustice: Read
n.
(不公平,不讲道义) unjust act; practice of being unjust or unfair

inland: Read
a.
(内陆的,内地的,向内地,在内地) within the land; more or less remote from the ocean or from open water; interior

innocent: Read
a.
(无罪的,无辜的,清白的) naive; lacking sense or awareness; free from evil or guilt

innovate: Read
v.
(改革,革新) change or alter by bringing in something new

innovation: Read
n.
(发明,变革) introduction of something new

innumerable: Read
a.
(数不清的,无数的) countless; numerous

inquire: Read
v.
(问,询问) ask a question; seek for truth or information by putting queries

inquiry: Read
n. Syn. investigation; quest
(质问,调查) investigation; search for knowledge

insane: Read
a.
(疯狂的) exhibiting disordered of mind; deranged in mind; very foolish

insert: Read
v. Syn. input; enter
(插入) input; enter; put or set into, between, or among

insider: Read
n.
(局内人,圈内人) an accepted member of a group; one who has special knowledge or access to confidential information

insight: Read
n. Syn. understanding
(洞察力,见识) understanding; grasping the inner nature of things intuitively

insignificant: Read
a. Syn. trivial
(无关紧要的,可忽略的,无意义的) not large enough to consider or notice; lacking in importance; trivial

insist: Read
v. Syn. maintain; contend
(坚持认为,坚决主张) stand or rest; find support; take a stand and refuse to give way; be persistent

insolvent: Read
a. Syn. bankrupt
(破产) bankrupt; unable to repay one's debts

inspect: Read
v. Syn. examine
(检查,审查) look over; examine carefully and critically, especially for flaws

inspection: Read
n.
(检查,细看) formal or official examination

inspector: Read
n.
(检查员,巡视员) high ranking police officer; investigator who observes carefully

inspiration: Read
n.
(灵感) sudden intuition as part of solving a problem; arousing to a particular emotion or action

inspire: Read
v. Syn. encourage; inspirit
(鼓舞,给以灵感) encourage; inspirit; fire the imagination of

install: Read
v.
(安装,设置) set up; connect or set in position and prepare for use

installation: Read
n.
(就职,安装) act of installing or giving possession of an office, rank, or order, with the usual ceremonies; the whole of a system of machines or apparatus

installment: Read
n.
(分期付款) monthly payment; a part of a published serial

instance: Read
n. Syn. example
(实例,例证) example that is cited to prove a contention or illustrate a point; case or occurrence

instinct: Read
n. Syn. intuition; drive; nature
(本能,直觉) inborn pattern of behavior ; nature

instinctive: Read
a. Syn. spontaneous
(天生的,本能的) unthinking; prompted by instinct; spontaneous

institute: Read
n.
(学院,学会,协会) advance or set forth in court; association organized to promote art or science or education

institution: Read
n. Syn. institute; organization; custom; convention
(机构,惯例) institute; organization; introducing something new

instruct: Read
v. Syn. teach
(教,命令) teach; make aware of

instruction: Read
n. Syn. direction; teaching
(命令,指示,教学) direction; teaching; activities of educating or instructing

instructive: Read
a. Syn. didactic; enlightening
(有益的,教育性的) serving to instruct of enlighten or inform; enlightening

instrument: Read
n. Syn. tool; implement; device
(仪器,工具,乐器) tool; one used by another to accomplish a purpose; device used to produce music; legal document

instrumental: Read
a. Syn. effective; helpful; necessary
(有帮助的,可作为手段的) serving or acting as a means or aid; helpful; relating to musical instruments

insufficient: Read
a.
(不足的,不够的) of a quantity not able to fulfill a need or requirement

insulate: Read
v.
(使绝缘,使隔离) make an island of; place in a detached situation, or in a state having no communication with surrounding objects; isolate; separate

insulation: Read
n. Syn. isolation; separation
(绝缘,隔离,孤立) act of insulating; separation; state of being detached, from other objects

insult: Read
v. Syn. offend; affront
(侮辱,凌辱) offend; affront; treat, mention, or speak to rudely

insurance: Read
n.
(保险,保险金额,保证,保障) protection against future loss; act, business, or system of insuring

insure: Read
v.
(保险) make sure or secure, specifically against loss by a contingent event; give or take insurance on

intangible: Read
a. Syn. vague
(难以明了的,无形的,暧昧的,模糊的) not able to be perceived by senses, as touch; vague

integral: Read
a. Syn. complete; entire
(一体的,完整的) essential or necessary for completeness; entire

integrate: Read
v. Syn. combine
(整合,合并) make whole; combine; make into one unit

integrity: Read
n. Syn. uprightness; wholeness
(完整性) quality or condition of being whole or undivided; completeness

intellect: Read
n.
(智力) ability to learn and reason; ability to think abstractly or profoundly

intellectual: Read
n.
(智力的) of intellect; showing intellect; requiring the use of the mind, rather than emotions or instinct

intelligence: Read
n.
(智力,聪明) ability to comprehend; understand and profit from experience; intellect; power of cognition

intelligent: Read
a. Syn. ingenious; wise; bright
(聪明的,有才智的) ingenious; wise; bright; having a high degree of intelligence; mentally acute

intense: Read
a. Syn. extreme; acute
(强烈的,剧烈的) extreme; acute; in an extreme degree

intensive: Read
a. Syn. thorough; concentrated
(加强的,集中的,密集的) thorough; concentrated; tending to give force or emphasis

intent: Read
n.
(意图,故意,目的) something that is intended; aim or purpose

intention: Read
n. Syn. motive; purpose
(意图,目的) motive; with respect to marriage; aim that guides action

interact: Read
v. Syn. interplay
(互相作用,互相影响) interplay; act together or towards others or with

interaction: Read
n. Syn. communication
(相互作用) communication; a mutual or reciprocal action; interacting

interest: Read
n. Syn. attention; curiosity; dividend; yield
(兴趣,利息) attention; curiosity; dividend; yield

interfere: Read
v. Syn. disrupt; hinder; obstruct
(妨碍,干涉) disrupt; hinder; be or create a hindrance or obstacle

interference: Read
n. Syn. obstruction; prevention
(冲突,干涉) obstruction; prevention; act or an instance of hindering, obstructing, or impeding

interior: Read
n. Syn. inside; internal; inner
(内部(的)) inside; inner part; internal; inner

intermediate: Read
a.
(中间的,中级的) middle; lying between two extremes

internal: Read
a. Syn. inside; interior
(内在的) inside; interior; located within the limits or surface

interpret: Read
v.
(解释,说明,翻译) explain or tell the meaning of; translate orally; decipher

interpretation: Read
n. Syn. explanation
(解释) explanation; performer's distinctive personal version of a song, dance, piece of music

interrupt: Read
v. Syn. impede; discontinue
(打断,使中断) terminate; make a break in

interval: Read
n. Syn. pause; break
(间隔时间) pause; break; space between two objects, points, or units

intervene: Read
v.
(干预,干涉) get involved; come, appear, or lie between two things

intimate: Read
v. Syn. hint; suggest
(暗示,提示,宣告) give to understand; imply as a possibility; make known subtly and indirectly

intrude: Read
v. Syn. trespass
(强挤入,侵入,强加于人) trespass; enter as an uninvited person

inundate: Read
v. Syn. overwhelm; flood; submerge
(淹没,吞并) overwhelm; cover with water, especially floodwaters

invade: Read
v. Syn. intrude; aggress
(侵略,侵犯) move into; intrude; enter by force in order to conquer or pillage

invader: Read
n. Syn. assailant; encroacher; intruder
(侵略者) one who invades; assailant; encroacher; intruder

invalid: Read
a. Syn. void; null
(无效力的) of no force or weight; not valid; weak; void; null

invalidate: Read
v. Syn. nullify; destroy
(摧毁,使无效,弱化) make invalid; nullify; destroy

invaluable: Read
a.
(无价的,其价值无法衡量的) valuable under estimation; inestimable; priceless

invariably: Read
ad. Syn. constantly; always
(不变地,总是) constantly; always

invasion: Read
n. Syn. raid; attack; aggression
(入侵) raid; attack; act of invading, especially the entrance of an armed force into a territory to conquer

inverse: Read
a. Syn. opposite
(倒转的) opposite; reversed in order, nature, or effect; turned upside down

invest: Read
v.
(投资,投入(精力,时间)) put clothe on, as with office or authority; place in possession of rank, dignity, or estate; endow; lay out money or capital in business

investigate: Read
v. Syn. explore; research; survey
(调查,研究) explore; observe or inquire into in detail; examine systematically

investigation: Read
n. Syn. inquiry
(调查) detailed inquiry or systematic examination; inquiry

invisible: Read
a.
(看不见的,无形的) incapable of being seen; impossible or nearly impossible to see

invoice: Read
n.
(发票,开发票) bill; commercial document issued by seller to buyer indicating the products, quantities and prices

involve: Read
v.
(牵涉,拖累,涉及) wind round; connect with something; include necessarily; engage thoroughly

irony: Read
n. Syn. sarcasm; satire
(反话,讽刺) expression by deliberate contrast between apparent and intended meaning; witty language used to insult

irregular: Read
a. Syn. piecemeal; inconstant
(不规则的,不整齐的) contrary to rule or accepted order or general practice; inconstant

irresistible: Read
a.
(不可抵抗的,不能压制的) overwhelming; tempting; charming

irrespective: Read
a.
(不考虑的,不论的) without regard for conditions, circumstances, or consequences; unbiased; independent

irrevocable: Read
a. Syn. unalterable; irreversible
(不能取消的,不能变更的) unalterable; irreversible; impossible to retract or revoke

irrigate: Read
v. Syn. water
(灌溉) supply land with water artificially; clean a wound with a fluid

irrigation: Read
n.
(灌溉) supplying water to the land to help crops grow

irritate: Read
v. Syn. prickle; annoy; provoke
(激怒,使过敏) rouse to impatience or anger; annoy; provoke

isolate: Read
v. Syn. seclude; separate
(使隔离,使孤立) seclude; set apart or cut off from others

isolation: Read
n. Syn. separation; detachment
(隔离,孤立) separation; detachment; quality or condition of being isolated

issue: Read
n. Syn. subject; topic; problem
(问题) subject; topic; problem; edition; publication; release; publish

item: Read
n.
(项目) a whole individual unit; a distinct part that can be specified separately in a group

ivory: Read
n.
(象牙,乳白色,象牙制品) teeth of elephant; pale or grayish yellow to yellowish white