What is the difference between an act and a scene?

An act is one of the main divisions oa a play, an opera, etc. ( 戲劇或歌劇等的 ) 一幕

A scene is a part of a film/movie, play or book in which the action happens in one place or is of one particular type 場面 ; 片段 ; 鏡頭 ; one of the small sections that a play or an opera is divided into ( 戲劇或歌劇的 ) 場

eg. The hero dies in Act 5, Scene 3. 男主角在第 5 幕第 3 場死去。