1. 排练;彩排
    A rehearsal of a play, dance, or piece of music is a practice of it in preparation for a performance.

    e.g. The band was scheduled to begin rehearsals for a concert tour...
           这支乐队准备开始为巡演排练。
    e.g. When 'Can-Can' was in rehearsal, Porter felt that the title song needed a musical introduction.
           在排练《康康舞》的时候，波特感觉主题曲需要一个前奏乐曲。

2. 预演;试演;演习;演练
    You can describe an event or object which is a preparation for a more important event or object as a rehearsal for it.

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    e.g. The sketch should be a kind of rehearsal for the eventual painting...
           草图应该是最终绘画的某种演练。
    e.g. Daydreams may seem to be rehearsals for real-life situations.
           白日梦可能像是真实情景的预演。