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在深空探测任务中，航天器从行星际转移轨道进入环绕轨道，往往需要通过长时间点火减速。推进剂质量不仅直接决定了运载火箭的发射能力需求，也制约着航天器可搭载的科学载荷规模。如何在不显著增加航天器质量的前提下完成大尺度轨道调整，是行星探测工程长期面临的关键问题之一。

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（图片来源：《Advances in Space Research》）

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（图片来源：美国航空航天局）

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