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It started with a simple experiment: take some graphite - the black stuff in the middle of a pencil - and put a piece of tape over it. When the scientists at the University of Manchester did that, they found that they could develop a material that co
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Graphene Called Amazing, Versatile Material of the Future 前景光明的多功能材料石墨烯 In 2004, two scientists at the University of Manchester in England isolated a carbon-based material called graphene, with some unusual properties. Andre
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By Melinda Smith Washington, DC 04 January 2007 watch Meningitis in Children Meningitis can be infectious, particularly when the disease is spread among large groups of people living in crowded conditions. It is most prevalent in sub-Saharan Africa,
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Enam: Katia, what are the environmental problems in your country? Katia: Well, I can think of three problems. One is water drought. The scarcity of water. Second, we have a lot of air pollution, and third a lot of deforestation. Enam: OK, so can you
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A: Nice pen。 B: I got it over there. It's a steal。 假如在一部电视剧中听到这样两句对话，你会怎样理解呢？It's a steal是不是指笔是偷来的？B是贼吗？ 非也，非也。 A说nice pen是因为看到B有一支漂亮的
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