extemporized

例句:

• 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。
  
• The president extemporized a speech after the working dinner.
  总裁即席发表了一篇工作餐后演说.
  
• I spoke for an hour easily, and from that time always extemporized.
  我轻而易举地讲了一个钟头, 从那以后我就总是即席讲话了.
  
• I played the organ at which he had extemporized so often.
  来自E. Heath