以下为句子列表：
英文: A study using data on cloud cover taken from satellite images dating from 1979 found that 65% of the world's skies were covered by cloud when cosmic rays were weakest and 68% when they were strongest.
中文: 研究从1979年起卫星云图所示云量的数据，发现宇宙射线最弱时，全球空中65%的面积被云层覆盖；最强时这一数字为68%.
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英文: America's weakest borrowers, in short, were often able to buy a house without handing over a penny.
中文: 简而言之，最穷的借款人经常可以不用付一分钱就能买房。
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英文: Astronomers assume that it interacts only by means of gravitation, the weakest of all the known forces of nature.
中文: 天文学家假设，暗物质仅参与重力交互作用，重力是自然界中已知最弱的一种力。
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英文: But nine of the 13 models signal undervaluation, with the median value suggesting the yen is 15% too cheap—the weakest currency in the chart.
中文: 不过13个模型中有9个表明日元低估，其中间价值显示日元低估15%——图表中最疲软的货币。
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英文: Chinese are the weakest link in this earth.
中文: 中国人是地球上一群最虚弱的单元。
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