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n.
(麻醉的,催眠的) addictive drug, such as opium, that reduces pain, alters mood and behavior; inducing sleep


Spelling Word: narcotic
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n.
(航海) guidance of ships or airplanes from place to place


Spelling Word: navigation
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a.
(可商量的,(支票)可兑现的) capable of being negotiated; transferable by assignment or endorsement to another person


Spelling Word: negotiable
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n.
(贵族,高贵的身份,高贵) quality or state of being noble; superiority of mind or of character; commanding excellence; eminence


Spelling Word: nobility
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a.
(恳切的,热心助人的) happy and ready to do favors for others


Spelling Word: obliging
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a. Syn. forgetful
(遗忘的,出神的) inattentive or unmindful; lacking all memory; forgetful


Spelling Word: oblivious
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n.
(遵守,奉行(法律,习俗)) act or practice of observing or noticing with attention; an act, ceremony, or rite, as of worship or respect


Spelling Word: observance
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a. Syn. outmoded; antiquated
(过时的,无用的) no longer useful; outmoded; antiquated


Spelling Word: obsolete
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n.
(征兆,预兆) any indication or action regarded as a foreshowing; phenomenon supposed to portend good or evil


Spelling Word: omen
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a. Syn. threatening
(有威胁的,恶兆的) threatening; foreshadowing evil or tragic developments


Spelling Word: ominous