Extended voyages make carrying one-time-use resources impractical. A four-person crew on a 1,000-day Mars expedition would need 48 tonnes of consumables, matching the spacecraft's total mass1. Even with unlimited mass, storage space would be insufficient.
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各地进出口总额呈现怎样的区域分布格局？各地区的核心进出口品类有何特征？基于26万条海关原始记录，我们完成了系统性梳理。