单词：Pratt-Hayford isostasy
普拉特-海福德均衡
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Unit 3 TEXT I Three Sundays in a Week Text Robert, the narrator of the story, was left in the care of his Uncle Rumgudgeon when his parents died. He grew up with Kate, daughter of Uncle Rumgudgeon. Ka
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By Carol Pearson Washington, DC 29 May 2006 watch Autism Gene report Researchers at the University of Texas Southwestern have been able to genetically change mice so their behavior is similar to some people with autism. The researchers hope their di
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to make hay to go haywire 美国并不是一开始建国就是一个工业很发达的国家。其实，美国早期也是以农业为主的。现在生活在农村的美国人当然已经很少了。可
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经济学人商业系列