// 条件解读：栈非空 + 栈顶当前数 + 还有删除名额 → 弹出栈顶（移除大数）
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.，详情可参考WPS官方版本下载
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Раскрыты подробности о договорных матчах в российском футболе18:01，推荐阅读同城约会获取更多信息
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