通常，正式演出之前都会有三场彩排。

Usually three rehearsals are held before a performance.

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演出之前，我们排练了许多。

We practised a lot before the show.

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演出之前，他们在排练场上进行了最后一次彩排。

Before the performance, they held the last rehearsal on the rehearsal ground.

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I knew the storyline before I went, but when the lights went down, and then the story came out.

我去看之前就知道故事情节了，但当灯光暗下来，演出开始，

歌剧魅影 - SpeakingMax英语口语达人