他在出发前检查并拧紧了自行车上的所有螺丝。

He checked and tightened all the screws on his bike before the trip.

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He checked and tightened all the screws on his bike before the trip.

tightened 是动词 tighten 的过去式,tighten 由形容词 tight(紧的)加上动词后缀 -en 构成,意思是"使变紧、拧紧"。

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