[kāi chǎng bái]
（演出开场时引入本题的道白） prologue
He forgot his carefully prepared opening remarks.
原来准备好的那一套开场白被他忘得一干二净。
The presider intended to open with an important piece of news in order to attract the attention of the reporters present.
主持人准备挑一项重要新闻作为开场白， 以引起与会记者的注意。