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