extemporize

US /ɪkˈstem.pə.raɪz/
UK /ɪkˈstem.pə.raɪz/
"extemporize" picture
1.

即兴创作, 即兴表演

to compose, perform, or utter something without preparation; improvise

:
The jazz musician could extemporize a solo on the spot.
这位爵士乐手可以当场即兴创作一段独奏。
She had to extemporize a speech when the main speaker didn't show up.
当主讲人没有出现时,她不得不即兴发表一篇演讲。