"The entire sequence of Artemis flights needs to represent a step-by-step build-up of capability, with each step bringing us closer to our ability to perform the landing missions. Each step needs to be big enough to make progress, but not so big that we take unnecessary risk given previous learnings."
定方向：求「下一个」→ 倒序；求「上一个」→ 正序。
，这一点在Line官方版本下载中也有详细论述
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