(pl. -os)
1- a dark plate or screen used to shield a lens from light透镜遮光片。
1.1
- Theatre a partial screen used in front of a spotlight to project a shape【戏剧】遮光屏。
1.2
- a shield used to mask a microphone from extraneous noise（扬声器上的）杂音过滤布。
词源
1930s: of unknown origin, perhaps from go between.