a person who invents or makes something, such as a speech or a device, at the time when it is needed without already having planned it

Teachers have to be great improvisers. 教师必须是伟大的即兴表演者。

They are great improvisers, too, making things out of old scrap: machine parts, nails, and utensils of all kinds. 他们也是出色的即兴创造者，用废旧料造出东西：机器零件、钉子和各种器皿。

an actor or musician who performs without prepared speech or music, making up the play, music, etc., as it is performed

jazz-funk improvisers 放克爵士乐的即兴演奏者

He is a talented dancer and gifted improviser. 他是一位才华横溢的舞者和天才的即兴表演家。