2 sentences

1. 这出戏的开场白由一位老演员负责朗诵。

   zhè chū xì de kāi​chǎng​bái yóu yī wèi lǎo yǎn​yuán fù​zé lǎng​sòng.

   The prologue of this play is recited by a veteran actor.

   Source: Dong Chinese Dictionary

2. 他的开场白很幽默，一下子就吸引了全场观众。

   tā de kāi​chǎng​bái hěn yōu​mò, yī​xià​zi jiù xī​yǐn le quán chǎng guān​zhòng.

   His opening remarks were very humorous and immediately captivated the entire audience.

   Source: Dong Chinese Dictionary