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[地名] 科波萨盐沼 ( 智 )
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Parts of Chile are facing a growing water crisis. The Reuters news agency reports the government is taking steps to protect the countrys water supplies from mining operations. But for many years, the Chilean government approved water extraction right
发表于:2019-01-03 / 阅读(160) / 评论(0)
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Is America in a Math Crisis? 美国陷入数学危机? NEW YORK It is often said mathematics is a cornerstone of learning. Communications, computer science, the arts, the Internet, space exploration - all are based on underlying mathematical concepts
发表于:2019-01-14 / 阅读(111) / 评论(0)
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