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a. Syn. harmful
(有害的) harmful to living things; injurious to health


Spelling Word: noxious
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n. Syn. gradation; shade
(细微差别) subtle or slight degree of difference; small difference in meaning


Spelling Word: nuance
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a. Syn. many; various
(众多的,很多的) many; various; amounting to a large indefinite number


Spelling Word: numerous
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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.
(离岸的,海面上的) at some distance from the shore


Spelling Word: offshore
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n. Syn. start; assault
(开始,发作,攻击) beginning or early stages; offensive against enemy


Spelling Word: onset
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n.
(乐观主义) tendency to expect the best possible outcome; belief that the universe is improving and good will win over evil


Spelling Word: optimism
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n. Syn. path; circle
(轨道) path; circle; move in an orbit; encircle


Spelling Word: orbit
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n. Syn. band
(管弦乐队) band


Spelling Word: orchestra
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a. Syn. old; outmoded; antiquated
(过时的,不流行的) old; old-fashioned; antiquated; out of date


Spelling Word: outdated