A signal, such as a word or an action, used to prompt another event in a performance, such as an actor's speech or entrance, a change in lighting, or a sound effect. 提示一種信號,如一個(gè)詞或一個(gè)動(dòng)作,用來(lái)提示演出中的下一個(gè)項目,如某一演員的臺詞或入場(chǎng)、燈光的變化或者音響效果