adlib

主持人忘词时，她即兴发挥说了一段俏皮话。

When the host forgot his lines, she had to ___adlib a witty remark.

这位喜剧演员以在舞台上即兴表演而闻名。

The comedian is famous for his ability to ___adlib on stage.

导演要求演员们在拍摄中即兴发挥几句台词。

The director asked the actors to ___adlib a few lines during the scene.