backdrop

1. N-COUNT A backdrop is a large piece of cloth, often with scenery painted on it, that is hung at the back of a stage while a play is being performed. 舞台背景

2. N-COUNT The backdrop to an object or a scene is what you see behind it. 背景[usu N prep]

...the rugged cliffs that formed a backdrop to the village. ...构成村庄天然屏障的崎岖峭壁。

3. N-COUNT The backdrop to an event is the general situation in which it happens. 事件的背景[usu N prep]

The election will take place against a backdrop of increasing instability. 选举的背景是逐渐不稳的局势。