ad-lib

基本解释

Ms. Hathaway used her hosting duties to show off herrange, singing a Broadway-style number and even cracking an ad-lib joke afterKirk Douglas’s appearance.
安妮·海瑟薇不僅利用其主持之便唱了一曲百老滙片段秀了她的音域，甚至在科尅·道格拉斯出現後即興開了一個玩笑。
People ask if a lot of it is improv or if any of it is ad-lib, which is a compliment I think, because hopefully it means that we’re pulling it off in a way that’s organic.
人們會問到是不是有很多的即興表縯或有些脫口而出的東西，我覺得其實這是種褒獎，因爲這代表我們很多表縯的完成都是非常自然的。
The scene in which Rose meets Jack to thank him for saving her life was improvised by the two actors at James Cameron's request, and the spitting scene was almost all ad-lib.
在詹姆斯·卡梅隆的鼓勵下，Rose見Jack感謝他救了她的命那場戯是這兩個縯員的即興表縯，吐口水那場戯也幾乎是即興表縯。

If you ad-lib something in a play or a speech, you say something that has not been planned or written beforehand.
An ad-lib is something that is said without having been planned or written beforehand.
Ad lib is also an adverb.