past master

• 1. 

  N-COUNT If you are a past master at something, you are very skilful at it because you have had a lot of experience doing it. 行家; 老手 [usu N 'at/in/of' n]

  例：

  He was a past master at manipulating the media for his own ends.

  操纵媒体为自己服务他是老手。

  例：

  She is an adept rock-climber and a past master of the obstacle course.

  她擅长攀岩，也是障碍超越训练场上的老手。