名詞 backdrop:

1. scenery hung at back of stage
   同義詞：background, backcloth

1. The movable screen or drape in a theater or hall that separates the stage from the auditorium or that serves as a backdrop.
   幕布在劇院或大廳內隔開舞臺和觀眾或作為背景幕的可移動遮蔽物或帷幕

back.drop

n.（名詞）
A painted curtain hung at the back of a stage set.Also called backcloth
背景幕：掛在舞臺后部的彩色幕布也作 backcloth
The setting, as of a historical event; the background.
背景：背景，如歷史事件的背景；背景情況