v. undo the buttons of
vt. 解开...的钮扣
vi. 解开钮扣
1. She decided to unbutton her jacket because it was too warm.
她决定解开外套的扣子，因为天气太热了。
2. Before going to bed, he always unbuttons his shirt.
睡觉前，他总是解开衬衫的扣子。
3. Please unbutton your coat when you come inside.
进屋时请解开你的外套扣子。