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火星上有啥？不辞万苦“取样”，美国给6个原因，中国可能落伍？
美国和欧洲空间局计划在2026年进行取样返回探测，我国也已经制定了取样返回的计划。取样返回将成为未来火星探测的重要方式。取样返回的必要性和意义有6个方面
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