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Helium is used to pressurize tanks and help push fuel into the engines. Without proper helium flow, the rocket cannot safely fly. Because the upper stage is hard to reach at the launchpad, NASA rolled the stacked rocket back into the Vehicle Assembly Building, the sky-scraping hangar where it was originally put together.。关于这个话题，Line官方版本下载提供了深入分析
，这一点在safew官方版本下载中也有详细论述
Кирилл ДмитриевСпецпредставитель президента России，更多细节参见搜狗输入法下载
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Екатерина Ештокина