... outer planets mission ==> 外行星飞行任务 outer planets spacecraft ==> 外行星航天器 outer plexiform layer ==> 外网状层 ...
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IN the summer of 1977 two American spacecraft were launched on what is arguably the grandest mission ever: the exploration of the outer planets of the solar system and the space that lies beyond.
1977年的夏天，两位美国飞行员被选中投身于可以说是有史以来最伟大的使命：对太阳系及更远空间的外太空探索。
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