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.
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还有另一个问题，我相信大部分 Mac 用户都不喜欢别人用手指戳自己的电脑屏幕。MacBook 屏幕的「娇气」几乎可以和它的高素质齐名。如果直接频繁触碰屏幕，很容易对表面涂层造成损伤。