He is rather disjointed when he ad-libs.
他即興表演時(shí)，有些語(yǔ)無(wú)倫次。
柯林斯例句
The speech was full of ad - libs and witty asides.
講演中滿是即興之詞和詼諧離題之語(yǔ).
《簡(jiǎn)明英漢詞典》
His ad - libs got him in trouble with the politicians.
他的即興發(fā)言令他與政客們發(fā)生了沖突.
互聯(lián)網(wǎng)