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发表于:2018-12-08 / 阅读(207) / 评论(0)
VOA2005（上）--环境科学探索
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ESA to Make 3D Map of Milky Way 欧洲太空总署绘制银河系的3D地图 The European Space Agency this week successfully launched the star-mapping satellite Gaia on a mission that will take it more than a million kilometers from Earth - to creat
发表于:2018-12-08 / 阅读(184) / 评论(0)
VOA常速英语2013年(十二月)
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