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发表于:2018-12-01 / 阅读(80) / 评论(0)

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发表于:2018-12-16 / 阅读(109) / 评论(0)

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发表于:2019-01-01 / 阅读(37) / 评论(0)

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PEOPLE IN AMERICA - Thomas Edison, 1847-1931: America's Great Inventor ANNOUNCER: Welcome to the VOA Special English program, People in America. Today, Sarah Long and Bob Doughty tell about the inventor Thomas Alva Edison. He had a major effect on th

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闭着眼睛飘单词四级词汇

The Motion of Mars

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blast furnace gas burner