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[每天一篇英语新闻] 每天一篇英语新闻:黑科技 探索外太空
Power to the stars SPACEX and Blue Origin, two American space companies, can now return their rockets to Earth and reuse them, which promises to reduce launch costs.2016-05-25 编辑：ivy
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Filename: libraries/Cache_file.php
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2016-05-25 编辑：ivy
