格隆汇8月23日|SpaceX首席执行官埃隆·马斯克在回复一位X网友讨论火箭发射技术的帖子时称:“制造一种完全可重复使用的轨道火箭是有史以来最难的工程问题之一。比登月难多了,这就是为什么它还没有解决的原因。
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