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

　　他是一個在電視喜劇表演中不斷尋求突破的演員。

　　He was the star performer at the championships.

　　他是那屆錦標賽上的最佳運動員。

　　She was no mean performer on a variety of other instruments

　　許多別的樂器她也演奏得相當出色。