原因说起来简单：这个领域没有全能王。
NASA leaders argued that it makes more sense to uncover problems and practice operations close to home, in Earth orbit, rather than discovering them for the first time while attempting a landing on the moon. If the faster launch tempo holds, Artemis IV and Artemis V together could give NASA two opportunities in 2028. Officials stressed that the timeline still depends on hardware readiness and safety reviews.，详情可参考safew官方下载
这样的趋势会领向什么样的终极形态，目前行业还在探索之中，苹果当然不希望自己掉队。，更多细节参见Line官方版本下载
Photograph: Simon Hill