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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.，推荐阅读91视频获取更多信息
[7] B. E. Bayer: “An optimum method for two-level rendition of continuous-tone pictures” (1973). ↑，推荐阅读safew官方版本下载获取更多信息
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