trainer

n. 训练者,驯服者,驯马师

One who acts as the trainer or second of a boxer.

拳击手的训练者或其比赛时的助手

He has a dual interest in the football team; he's the trainer and his son plays for them.

他跟那个足球队有双重关系，他是足球队教练，他的儿子是队员。