即兴表演

Charles had to ad-lib because he'd forgotten his script.

查了台词只好即兴表演。

As part of the celebrations they staged a big,open-air multimedia event,with music,videos,poetry readings,dance and improvisations.

在庆典中,他们举行了大型的露天多媒体活动,其中有音乐、录像、朗诵、舞蹈和即兴表演。