[kāi chǎng bái]
（演出開場(chǎng)時(shí)引入本題的道白） prologue
He forgot his carefully prepared opening remarks.
原來準(zhǔn)備好的那一套開場(chǎng)白被他忘得一干二凈。
The presider intended to open with an important piece of news in order to attract the attention of the reporters present.
主持人準(zhǔn)備挑一項(xiàng)重要新聞作為開場(chǎng)白， 以引起與會(huì)記者的注意。