extempore
adj. 即席的,当场的
1. with little or no preparation or forethought;
1. without prior preparation;
The song was composed extempore.
这个曲子是即席作成的.
A great poet once wrote an extempore poem here.
一位大诗人曾经在这里留题了一首诗.
occasionalextemporaneousunprepared