fas·ten·ing
noun/ˈfɑːsnɪŋ/
/ˈfæsnɪŋ/
- (also fastener)a device, such as a button or a zip, used to close a piece of clothing; a device used to close a window, bag, etc. tightly
纽扣；拉链；扣件 - the place where something, especially a piece of clothing, fastens; the way something fastens
（尤指衣服的）扣处，扣法 - The trousers have a fly fastening.
这条裤子是前开口的。
- The trousers have a fly fastening.