英汉解释

vi. 即兴演奏或演说；临时凑合
vt. 即兴演奏或演说；当场作成

同义词

v. ad-lib，extemporise，improvise，improvize

参考例句

1. The speaker can extemporize on any of a number of subjects.
该演讲人对若干题目中的任一个都能即席发言。
2. to extemporize without a plan or any preparation
无计划或无准备地临时作成
3. He have to extemporize because he have forget to bring his note.
他因为忘了带讲稿，只好即席发言。

英英解释

v.
  1. manage in a makeshift way; do with whatever is at hand
  2. perform without preparation

网络释义

extemporize
即席演说,即席作曲; 即席演说; 即兴演奏; 当场作成;