extemporize

动词 extemporize:

1. manage in a makeshift way; do with whatever is at hand
   同义词：improvise
2. perform without preparation
   同义词：improvise, improvize, ad-lib, extemporise

1. He had to extemporize because he had forgotten to bring his notes.
   他因为忘了带讲稿，只好即席发言。

ex.tem.po.rize

v.（动词）
ex.tem.po.rized,ex.tem.po.riz.ing,ex.tem.po.riz.es
v.tr.（及物动词）
To do or perform (something) without prior preparation or practice:
即兴做，当场表演：未经提前准备或练习而做或表演（某事物）：
例句：
extemporized an acceptance speech.
即兴致贺辞

v.intr.（不及物动词）
To perform an act or utter something in an impromptu manner; improvise:
即兴做某事：即兴表演或发表某事物；即兴而作：
例句：
.bravely demonstrating his ability to extemporize intelligently.(William Safire)
.勇敢地展示他的智慧的即席表演才能.(威廉·萨菲尔)

【引伸】
extem.poriza.tion
extem.poriz.er
n.（名词）