单词：high-duty silica
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hallmark?of?excellence?品质保证 英文释义: The?reputation?that?a?particular?brand?has?earnedfor?consistently?high?quality. (NOTE: hallmark?isa?symbol?or?stamp?that?guarantees?the?quality?of?aprecious?metal?such?as?silver?or?gold). 例句? As?t
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69. It's about time... 该是的时候了 用法透视 也可以说it is high time，后面的句子中的动词要用虚拟语气。 支持范例 1. It's about time that he learned to look after himself. 现在该是他学会照顾自己的时候了。 2. It's high time that he was taught a lesson.
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Plant Self-defense Plants may appear to be helpless in the face of hungry,toothy animals but many plants have evolved interesting systems of self-defense. Coarse meadow grasses are a good example. If you run your finger along a blade of coarse grass,
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The career you choose will affect the future course of your life, such of your range of friends,your choice of husband or wife, where you live, your recreational activities,and other important aspects.To make a good choice,you must have a clear knowl
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AS IT IS 2015-07-14 Silica Sand Mining Worries Communities 美国硅砂矿引发社区担忧 The United States is increasing production of oil and natural gas through a process known as fracking. This process is sometimes called hydraulic fracking be
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AILSA CHANG, HOST: Despite mounting evidence and a stream of dire warnings, federal regulators and mining companies failed to protect coal miners from toxic dust. MARY LOUISE KELLY, HOST: NPR and the PBS series Frontline spent more than a year lookin
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