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.
参赛作品要求设计方向：题材不限，但须结合产品的「透视窗」物理特性，考虑 CD 旋转时的动态视觉效果，而非简单的图案覆盖。。关于这个话题，Line官方版本下载提供了深入分析
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printf("排序后: ");
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