在动力飞行，那些最早的日子，这么多尚未被证明是对飞机的技术和处理，几乎所有的驾驶员是各种各样的试飞员。

In those earliest days of powered flight, when so much had yet to be proven about aircraft technology and handling, almost any pilot was a test pilot of sorts.

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航天飞机在最初四次试飞阶段安装了弹射座椅，但仅仅是为前面两个驾驶员加装了这一装置。

The space shuttle used ejector seats during its first four test flights - but only for the two pilots up front.

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