NASA的确有行星的保护计划。例如宇宙飞船是消毒过的，有时候在任务完成后会被销毁。
NASA does have a planetary protection program where spacecraft are sterilized and sometimes destroyed at end-of-mission.
NASA的确有行星的保护计划。例如宇宙飞船是消毒过的，有时候在任务完成后会被销毁。
NASA does have a planetary protection program where spacecraft are sterilized and sometimes destroyed at end-of-mission.
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