perform的名词表演者

　　He is a performer who consistently pushes the envelope of TV comedy.

　　他是一个在电视喜剧表演中不断寻求突破的演员。

　　He was the star performer at the championships.

　　他是那届锦标赛上的.最佳运动员。

　　She was no mean performer on a variety of other instruments

　　许多别的乐器她也演奏得相当出色。