然后，选择将用于旁白员或报幕员的声音，并记录开始时间，以便在剧本运行完时可以知道它运行了多长时间。

Then, you select the voice to be used for the narrator or announcer, and note the beginning time so that you can get a measure of how long the play is when it has finished running.

youdao

在实际的剧场中，可以看到幕布在每一幕开始时被拉开，在结束时被合上，让置景工可以为剧本的下一幕改变背景。

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.

youdao