月亮上没空气，没法用降落伞，比在火星着陆难的多。

来源: 去看北极光于 2013-12-10 10:51:32 [旧帖] [给我悄悄话] 本文已被阅读：次

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月亮上没空气， 没法用降落伞，比在火星着陆难的多。