ad-libs

He is rather disjointed when he ad-libs.

他即兴表演时，有些语无伦次。

柯林斯例句

The speech was full of ad - libs and witty asides.

讲演中满是即兴之词和诙谐离题之语.

《简明英汉词典》

His ad - libs got him in trouble with the politicians.

他的即兴发言令他与政客们发生了冲突.

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