单词：wreitten
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Gravitational Waves Detected, Einstein Is Right 引力波存在证明爱因斯坦是正确的 尽管花费了100年时间，最终科学家还是证明了爱因斯坦的理论是正确的，引力波确实存在 The waves were predicted as part of Ei
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2016年VOA慢速英语(二)月
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HARI SREENIVASAN: After two decades in business, Amazon.com is the world's largest Internet retailer, with a stock value that has increased tenfold since 2008. That success is driven by a work force motivated by data-driven managers who stick to prin
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PBS访谈商业系列