recognition. This format remains in use today, to the extent that checks remain
"We know that's all going to change," he said.
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Анна Габай (Редактор отдела «Силовые структуры»)
重复遍历数组，比较相邻元素，如果顺序错误就交换
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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.
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