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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面对来自德国的外甥和镜头，大舅无所顾忌，他直言财产当年被掠夺。但他谈论战争本身甚少，弥漫于言谈间的，多是家庭创痛。