extemporize
vt. 即興創作,即席演奏
If you extemporize, you speak, act, or perform something immediately, without rehearsing or preparing it beforehand.
He completely departed from the text and extemporized in a very energetic fashion.
他完全脫稿,慷慨激昂地進行即席演說。
1. manage in a makeshift way; do with whatever is at hand;
2. perform without preparation;
He had to extemporize because he had forgotten to bring his notes.
他因為忘了帶講稿,只好即席發言.