unfasten something
及物用法，宾语常为衣服、带子等需要解开的东西。
He is unfastening the buttons on his shirt.
他正在解开衬衫上的纽扣。
解开，松开（如纽扣、拉链或结）
（自己）松开，解开；解开(尤指衣服或带子)( unfasten的现在分词 ); 松开; 解开；脱开；松开
to cause something to become undone, such as a button, zipper, or knot
常指解开衣物或带子
解开(尤指衣服或带子)( unfasten的现在分词 ); 松开; 解开；脱开
n loosening the ties that fasten something; the untying is easy"；v cause to become undone；v become undone or untied
She was unfastening her necklace when it slipped and fell.
她正在解开项链时，项链滑落掉在了地上。
用法提示：现在分词用于过去进行时，表示正在进行的动作。
Unfastening the seatbelt can be tricky if you're in a hurry.
解开安全带如果匆忙可能会很棘手。
用法提示：动名词作主语，表示一个动作或过程。
He kept unfastening and refastening the button nervously.
他紧张地不停解开又扣上纽扣。
用法提示：现在分词用于过去进行时，表示反复进行的动作。
及物用法，宾语常为衣服、带子等需要解开的东西。
He is unfastening the buttons on his shirt.
他正在解开衬衫上的纽扣。
不及物用法，表示物体自行松开。
The zipper is unfastening by itself.
拉链自己松开了。
名词用法，表示解开的过程或动作。
The unfastening of the rope took only a few seconds.
解开绳子只花了几秒钟。
grammar · medium
易错句子He made three unfastenings of his shirt.
正确表达He unfastened his shirt three times.
Unfastening 作为名词时是不可数名词，表示‘解开’的动作或过程，不能用于表示可数的次数。应改用动词形式 unfastened 并加次数状语。
grammar · medium
易错句子She is unfastening her shoelaces.
正确表达She is untying her shoelaces.
Unfastening 通常用于解开带扣、纽扣或拉链等，而鞋带应用 untying，因为 untie 专门表示解开系着的带子或绳索。
undoing 常用于比喻义（如‘毁掉’），而 unfastening 仅指物理上的解开。
untying 特指解开绳结或系带，unfastening 更通用，包括纽扣、拉链等。
detaching 强调将物体从连接处分离，unfastening 强调松开固定物。
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可生成：动词变形 Verb forms。只有点击后才会开始生成。
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