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.
N-COUNT
（实物或景象的）背景，衬托
The backdrop to an object or a scene is what you see behind it.
例句
Leeds Castle will provide a dramatic backdrop to a fireworks display next Saturday...利兹堡将为下周六的烟花燃放提供美妙的背景衬托。Light colours provide an effective backdrop for pictures or a mirror.浅色是挂放图画或镜子很有效果的衬托。
N-COUNT
（事件的）背景
The backdrop to an event is the general situation in which it happens.
例句
The election will take place against a backdrop of increasing instability.选举将在愈加动荡不安的局势下举行。
英汉词典释义
n.
<戏>背景幕布
A storm-tossed ship was painted on the backdrop for the first act of the modern drama named Pirate.名为《海盗》的话剧第1幕的背景幕布上画的是颠簸于惊涛骇浪中的一条船。
背景
The large bay has a superb backdrop of mountains.大海湾背靠着庄严的山脉。It is a love story set against a backdrop of rural Irish life.这是一个以爱尔兰乡村生活为背景的爱情故事。The World War Ⅱ provided the backdrop for the film.这部影片以二战为背景。War is more than just a dramatic backdrop to the novel.战争对这部小说来说不仅仅是个跌宕起伏的背景。The Alps provided the perfect backdrop for a romantic holiday.在阿尔卑斯山过一个浪漫的假日真是再完美不过了。The conference begins this week against a backdrop of unmitigated gloom.会议这个星期在一片愁云惨雾中开始。