ad lib

1. The ad lib joke in the play is the best.
   剧中即兴说的笑话最好。
2. I have forgotten to bring my note and have to speak ad lib.
   我忘记带讲稿了，只好临时讲几句。
3. His ad lib speech was wonderful.
   他的即兴演说真是妙极了。
4. She delivered her lines ad lib.
   她是即兴说出的台词。
5. The speaker had to ad-lib his speech when his papers suddenly blew off the podium.
   当演讲稿突然掉下台时，演讲者不得不现编词。

adv

1. without advance preparation
   1. he spoke ad lib

   Synonym:    ad libitumspontaneouslyimpromptu