ad-libbed, ad-libbing
no obj. speak or perform in public without previously preparing one's words即兴演说（或表演）：Charles had to ad-lib because he'd forgotten his script
查尔斯忘了带手稿只好即兴演说
with obj. she ad-libbed half the speech.她的演讲有一半是即兴的。
- something spoken or performed in such a way即兴演说（或表演）。
1
- spoken or performed without previous preparation即兴地（的）：
as adj. an ad-lib commentary即兴解说词, 即兴评论
as adv. I spoke ad-lib.我即兴讲话。
1.1
- Music (especially as a direction) to be performed with free rhythm and expression【乐】（尤作演奏演唱指示）自由发挥地（的）。
2
- as much and as often as desired不限制地（的）, 尽兴地（的）：
as adv. the price includes meals and drinks ad lib价格包含不限量的餐饮
as adj. the pigs are fed on an ad-lib basis.喂猪进食不限量。
词源
early 19th cent. (as an adverb)： abbreviation of AD LIBITUM.