单词：ultrahard material
单词：ultrahard material 相关文章
Be sure to study hard for that test!要为考试努力学习! How many times have you heard that? But what does it even mean to study hard? Do you have to study until your head hurts? It sounds like it! 听过这句话无数次了?但是到底什么才
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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
VOA标准英语2014年(二月)
Scientists Create Blackest Material Ever Of all the black things in the universe only the infamous black holes are so black that not even a tiny amount of light can bounce back. But scientists have managed to create material almost as black, and it h
VOA标准英语2014年(七月)
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
2017CRI中国国际广播电台
The hair stylist loves his job. He provides many services. He cuts people's hair shorter. It's very easy for him to do. He charges only $5. He straightens hair. This is hard for him to do. He charges $100. He dyes customers' hair. He lets customers p
英语第2级听力-English Level 2