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。

youdao

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。

youdao

With their lead cut to just four points at the break, the last thing the hosts needed was to have the talismanic O'Driscoll fail to reappear because of a knee injury, but they soon shrugged off his absence to extend their lead.

BBC: Leinster 41-11 Wasps