swab

中文： 拭子、棉签、擦拭物

1. A small piece of soft, absorbent material, such as gauze, used to clean wounds, apply medicine, or take samples of body fluids. Often attached to a stick or wire to aid access.
2. A sample taken with a swab (piece of absorbent material).
3. A piece of material used for cleaning or sampling other items like musical instruments or guns.
4. A mop, especially on a ship.
5. A low or contemptible person. (slang)
6. A naval officer's epaulet. (slang)

复数 swabs