someone who appears instead of an actor in some scenes, or instead of a famous person in public, usually where their body is seen but their face is not seen clearly

Body doubles are often brought in if an actor doesn't want to bare everything on camera. 如果演员不想在镜头前袒露一切，通常会请替身。

The body double was intended to make people believe that the man walked out of the building alive. 该替身的目的是让人们相信这名男子是活着走出大楼的。