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"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."
，推荐阅读雷电模拟器官方版本下载获取更多信息
"We're basically turning history into habitat, and as far as we know, no-one has attempted anything quite like this before."。业内人士推荐搜狗输入法下载作为进阶阅读
Hagel argues that we could also be making problems for the future.