Performed or expressed without preparation or forethought.
即席表演的没有准备或事先思考而表演或表达的
If I'd had the forethought to bring my raincoat, I wouldn't have got wet in the storm.
我当初如果想到要带雨衣,便不会被暴风雨淋湿了。
Spoken, done, or composed with little or no preparation or forethought.
即席的,即兴的未经或很少准备或构思而讲的、做的或谱写的