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铅是早在古代就已知的金属之一。Lead was one of the metals known to the ancient world.水银是一种已知的有毒物质。Mercury is a known poison.人们通常从已知的事实中推断未知的事实.People usually infer an unknown fact from a known fact....
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n.苯胺印刷（术）...
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depart for的音标：depart for的英式发音音标为：[di'pɑ:t fɔ:]depart for的美式发音音标为：[dɪ'pɑrt fɔr]...
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mediad的音标：mediad的英式发音音标为：['mi:dɪæd]mediad的美式发音音标为：['mɪdɪˌæd]...
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n.菜园...
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adj.感情的，情绪的，表现感情的n.感触性，易感性...
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我们的协议是以不扩散这一重要标准为基础的.Our agreement is founded on important nonproliferation standards.核不扩散条约将面临更大的压力.The Nuclear Non - Proliferation Treaty will come under further pressure.但《核不扩散条约》 ( NPT ) 现在看来正在经受考验.But the Nuclear No...
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Array...
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n.爆发，突然发生( outbreak的名词复数 )...
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Every man has his hobbyhorse.萝卜青菜,各有所爱.Don't get him started on his hobbyhorse.不要让他又开始他的老调重弹.Now he's started on his hobbyhorse.现在他又开始老调重弹了.Every man has his hobbyhorse .萝卜青菜，各有所爱...
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v.记入名簿上，选任（陪审员）( empanel的现在分词 )...
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“去铬”的拼音为：qù gè...
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Silhouetted against the sun stood the figure of a man.阳光映衬出一名男子的轮廓。We could see a church silhouetted against the skyline.我们可以看到一座教堂凸现在天际.The mountain was silhouetted against the sky.这座山在天际映出黑色影象....
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extremist的复数形式为：extremists...