名词
中文翻译：即兴演员
同义词：
['improviser', 'improvisor']
例句：
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1. The ad-libber was so good that the audience loved it.
那位即兴演员演得太好了，观众非常喜欢。
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2. He's an ad-libber and can perform any song on the spot.
他是个即兴演员，能即兴演唱任何歌曲。
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3. The ad-libber had to improvise his lines during the performance.
在表演中，这位即兴演员不得不即兴发挥台词。