spacer

中文： 垫片、间隔物、隔片

1. An object inserted to hold a space open in a row of items, e.g. beads or printed type.
2. A person who works or lives in space.
3. A bushing.
4. A forgetful person; one who spaces out. (slang)
5. A type of add-on device used by an asthmatic person to increase the effectiveness of a metered-dose inhaler.
6. An instrument for reversing a telegraphic current, especially in a marine cable, to increase the speed of transmission.

复数 spacers