Because they were bipedal, their arms were free to evolve flapping flight, which cannot be said for other reptiles of their time.

因为它们是两足动物，它们的手臂可以自由地进化出拍打的翅膀，这在当时的爬行动物中是不可能的。

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Through a large number of computer digital simulation experiments, this paper discusses the shift time of free flight and little single impulse individually.

本文通过大量的计算机数字仿真实验，研究了无冲量自由飞行轨迹与单个小冲量飞行轨迹的转移时间。

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Ensuring taxi conflict free and taking account of single flight taxi time, total taxi time of inbound and outbound flights was reduced.

在保证滑行道零冲突、兼顾单个航班滑行时间的前提下，缩小机场进出港航班总滑行时间。

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