umpire

/ˈəmˌpaɪər/

an official at a baseball game

Chinese meaning: 裁判员

The umpire called the runner out for leaving the base too early.

裁判判定跑垒员因过早离垒而出局。

A good umpire must make quick and fair decisions during the game.

一名好裁判必须在比赛中做出快速公正的裁决。