他解开安全带下了车。

He unfastened his seatbelt and got out of the car.

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He unfastened his seatbelt and got out of the car.

unfastened 是动词 unfasten 的过去式,由前缀 un-(表示"相反动作")和 fasten("系紧、固定")组成,字面意思是"松开固定",即"解开"的意思。

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