1
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）
先理解核心含义，再看它在真实句子里的用法。
解开，松开（如纽扣、拉链或结）
to cause something to become undone, such as a button, zipper, or knot
He is unfastening the buttons on his shirt.
他正在解开衬衫上的纽扣。
常指解开衣物或带子
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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。
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。
He kept unfastening and refastening the button nervously.
他紧张地不停解开又扣上纽扣。
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。
Not this
He made three unfastenings of his shirt.
Use this
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。
Not this
She is unfastening her shoelaces.
Use this
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。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
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作名词时表示‘解开’的动作或过程，不可数；作动词时为 unfasten 的现在分词
Dictionary facts from ECDICT.