The lights in the theatre dimmed as the curtain rose.
幕布升起，剧场内的灯光暗了下来。
《牛津词典》
2
It all seemed to him to have disappeared as though behind the curtain of a theatre.
他感到所有这一切好象都消失在剧院的一块幕布后面。
3
In a live theatre, you can see the curtain going up at the beginning of each act and down at the end, which allows the stage hands to change the scenery for the upcoming stage of the play.