NASA astronaut Mike Fincke has logged 549 days in space, with nine spacewalks totaling 48 hours and 37 minutes.
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。关于这个话题，旺商聊官方下载提供了深入分析
再直白点，就是你买回去要么自己跟维京重新谈，要么自己重做一套系统——成本？时间？自己掂量。
As a result, NASA will stick with the current version of the SLS with the addition of the "standardized" upper stage. No other details were provided.