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.
Number (2): Everything in this space must add up to 2. The answer is 2-1, placed horizontally; 1-6, placed vertically.
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市民小心翼翼地走在冰面上，冰面上坑坑洼洼净是冰碴儿。
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