Alex OsborneGuernsey
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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聽完我的不錯成績後，我心想：那麼，我是否有望在短短幾天內把這兩種語言中的至少一種學到不錯的水準呢？