单词：voltage controlled avalanche oscillator
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闭着眼睛飘单词 四级词汇
avalanche n 雪崩，山崩（大块雪或岩石沿着山坡下滑的现象） 【例】an avalanche of letters 雪片般飞来的信件 【记】读：爱挖烂车。西藏可以致富，就连雪崩都是致富的手段。有这么一种人特别爱挖
不择手段背单词
Keeping Time With Quartz Most people know that wrist watches commonly contain quartz. In fact, if you wear a watch, chances are its a quartz watch, since most watches is made today use quartz. But, you may not know what quartz has to do with keeping
英语听力文摘 English Digest
China has long depended on coal-burning power plants to fuel its explosive growth over the past three decades. As a result, air pollution has risen to alarming levels in central and eastern regions. Policymakers have been working hard to shift the co
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vacant a.空的；未被占用的 vain a.徒劳的；自负的 valid a.有效的；正当的 vapour n.汽，蒸气 variable a.易变的 n.变量 variety n.多样化；种类；变种 various a.各种各样
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