1. 即席演说,即席作曲：extemporaneous 即席,临时作成的 | extemporize 即席演说,即席作曲 | extend 延长
2. 即席演说：extemporization 即席作成 | extemporize 即席演说 | extemportize 即席演说
3. 当场作成：extemporizationextemporizeextemportize 即席演说 | extemporize 当场作成 | extemporize 即兴演奏
4. danci.911cha.com
4. 即兴演奏：extemporize 当场作成 | extemporize 即兴演奏 | extemportize 演唱
1. 即席演说;即兴表演
If you extemporize, you speak, act, or perform something immediately, without rehearsing or preparing it beforehand.
e.g. He completely departed from the text and extemporized in a very energetic fashion.
他完全脱稿，慷慨激昂地进行即席演说。
verb
1. perform without preparation
e.g. he extemporized a speech at the wedding
Synonym: improviseimprovizead-libextemporise
2. manage in a makeshift way
do with whatever is at hand
e.g. after the hurricane destroyed our house, we had to improvise for weeks
Synonym: improvise