还有，考虑到这次登月计划宇航员可能会在月球上野营六个月之久，比起1972年阿波罗计划的三天长得多，单独留下一个人也不可能。
What's more, with lunar campouts of up to six months planned--compared with the record three-day stay of Apollo 17 in 1972--leaving one crewmember alone is simply not tenable.
如果前面的计划能够全部成功，下一步计划就是实现可能会取代阿波罗计划中很多内容的第六个目标。
Should the proposed project meet with complete success, the stage would then be set for the sixth objective, which might supplant much of Project Apollo.
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