Theinvestigation showed that low temperatures on the day of the launch caused arubber “O-ring” seal on one of the rocket boosters to fail, which led to a leakof explosive gases.
调查显示，挑战者号发射当日低温，导致火箭推进器上橡胶O行环密封圈失效，进而引起爆炸性气体泄露。
You must return the money to me without fail by ten o 'clock tomorrow morning.
你必须明天上午十点之前把那笔钱还给我。
You must return the money to me without fail by ten o 'clock tomorrow morning.
你必须明天上午十点之前把那笔钱还给我。
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