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这篇文曾经非常火爆，影响了很多人，不知道还有多少人未读过，分享给大家，希望你们喜欢。 德裔美籍人塞缪尔厄尔曼70多年前写的一篇只有四百多字的短文，首次在美国发表的时候，引起
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Podcast is sponsored from the people of American Chemistry, who provide the plastics, medicines, and innovations that make life modern. Learn more at americanchemistry. com. This is Scientific American's 60-Second Science, Im Karen Hopkin. This will
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(man) Today I want to discuss fossil fuels such as coat, oil, and natural gas. The term fossil fuel refers to the trapped remains of plants and animals in sedimentary rock. You see, living plants trap energy from the sun by the process of photosynth
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The subject of many people's conversations is the flu. Everybody is talking about it. The clinics and hospitals are full of people who have flu symptoms, and supermarkets have shelves full of medicines, tissues(1), and vitamin powders. I've been luck
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China's Tibet Autonomous Region is about to achieve a universal coverage of fibre-optical broadband service ahead of its schedule. As China further rolled out its universal broadband project, Tibet's broadband service is looking to reach 98% of admin
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