单词：carbon black fibre
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Lesson 4 Black-lead 第四课 黑铅 What is the black-lead in your pencil made of? If you take a bit of the metal which we call lead, you will find that it is grey in colour, very heavy, and not at all like the black-lead in your pencil. But the lea
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This is Scientific American's 60-Second Science. I'm Amy Kraft. Got a minute? Out of control drivers aren't the only thing city cyclists have to worry about. New research suggests that cyclists are at increased risk of lung damage because of soot. A
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导购口语: I'd like to see the Apple computers. Do you have? 我想看看那苹果公司生产的电脑，有吗？ My office needs two copy machines. 我办公室需要2台复印机。 Here's a list of the items I want for my office: two boxes of
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本期内容： Couldchipfathelpdirtyshippingcleanupitsact? Theglobalshippingindustryisasbigacontributortogreenhousegasemissionsasaviation, andtheheavyfueloilthatpowersitsgiantvesselsisexceptionallydirty-packedwithsoot, blackcarbonandsulphur.InSeptem
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Voice 1 Hello, Im Marina Santee. Voice 2 And Im Ruby Jones. Welcome to Spotlight. This programme uses a special English method of broadcasting. It is easier for people to understand, now matter where in the world they live. Background voice On your m
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Science and technology 科学技术 Lifts and skyscrapers 电梯和摩天大楼 The other mile-high club 另一个高耸入云的俱乐部 A new lightweight lift cable will let buildings soar ever upward 一种新型的轻型升降梯将会让建筑继
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