动词
中文翻译：解开
同义词：
['unlatch', 'unhook', 'undo']
例句：
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1.She unfastened the buttons on her coat to reveal her dress underneath.
她解开了外套上的纽扣，露出了下面的连衣裙。
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2.The car keys were unfastened and dropped onto the floor.
汽车钥匙被解开并掉到了地板上。
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3. He unfastened his seatbelt and stepped out of the car.
他解开安全带，从车里走出来。