VERB
松開；解開
If you unfasten something that is closed, tied, or held together, or if you unfasten the thing holding it, you loosen or remove the thing holding it.
例句
When Ted was six we decided that he needed to know how to fasten and unfasten his seat belt...
特德六歲的時候，我們認為他得知道如何系上和解開安全帶了。
Reaching down, he unfastened the latch on the gate...
他伸手打開了門閂。