该计划成了航天飞机工程，最终在1981年4月12日结出硕果。 这一天哥伦比亚号航天飞机开始了首飞之旅，并于两天后安全返回。

This plan became the space shuttle program and it came tofruition on April 12, 1981, when Columbialaunched on the first space shuttle mission, and returned safely two dayslater.

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And the aeronautics engineer who wants to build an airplane has to obey, take into consideration, learn it, study and understand the law of gravity.

航空航天工程师,想制造飞机，必须遵守，加以考虑，学习，研究理解万有引力定律。

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