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dropout/ˈdrɔpˌaut/n. [c]辍学者，退学者：He might be a college dropout but he’s made a fortune in business.他可能中途离开大学，但在商界发了财。

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drought/draut/n.［c］旱灾；［u］旱；干旱: combat drought抗旱The crops died during the drought.干旱时庄稼死了。

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drown/draun/vi.&vt.1.淹死，溺死：She drowned in the river.她淹死在江里了。He would have drowned if I had not instantly fished him out.如果我没有马上把他捞起来，他就淹死了。A dr···

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drug/drʌɡ/ I.n.［c］1.药，药物: The doctor prescribed a new drug for his patient.医生给病人开了一种新药。The drug acts upon the nerves.这种药对神经有影响。2.麻醉药品，毒品(pl.): ···

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drum/drʌm/ I.n.［c］鼓；圆桶：beat/play the drum击鼓；a double drum双面鼓；the roll of drums隆隆的鼓声Mineral oil is shipped in large drums.石油是用大桶装运的。‖II.vi.用于短语动词···

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drunk/drʌŋk/adj.酒醉的：get blind/dead drunk烂醉如泥/酩酊大醉；be half drunk半醉；(as) drunk as the devil/a fish酩酊大醉；be drunk with wine喝醉酒；be drunk with joy (success)为快···

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dry/drai/ I.adj.(drier, driest)干燥的：dry air干燥空气；the dry season旱季；keep sth. dry保持干燥；a dry well枯井The clothes are dry.衣服干了。It was the driest summer in years.这是···

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dual/ˈdju(:)əl/adj.双(重)的，两重的：dual control双操纵；两国共管；dual nationality双重国籍；dual nature双重性

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dub/dʌb/ I.n.［c］1.击鼓声：hear sounds of dubs and songs in the distance听到远处传来的歌声和鼓声2.（AmE俚语）新手；笨蛋：He is a dub in playing tennis.他在打网球方面还是个新手。‖···

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dubious/ˈdju:bjəs/adj.1.有问题的，靠不住的：a rather dubious fellow一个相当可疑的人2.怀疑的，疑惑的，犹豫不决的：I’m very dubious about it.我对此感到非常怀疑。I feel dubiousas t···