即兴表演者

例句：

1. 1. The performer was an impromptu magician who entertained the audience with his tricks.
   这位表演者是一名即兴魔术师，他以他的魔术为观众带来娱乐。
2. 2. He decided to surprise his girlfriend with a romantic dinner on the spot.
   他决定在当场给她一个浪漫的晚餐惊喜。
3. 3. She was an impromptu speaker at the conference, delivering her speech in front of an audience.
   她在会议上是位即兴演讲者，向听众发表演讲。