mark vent
马克发泄
以上为机器翻译结果，长、整句建议使用 人工翻译 。
With the countdown nearing the 30-second mark, the launch had to be delayed briefly to investigate whether a vent arm had properly retracted, which it had.
随着倒计时靠近30秒的节点，发射不得不被延后去调查一只蒸汽臂是否已经被收回，事实上已经收回了。
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