handler

Compared meaning: someone who trains a person or animal (noun).

比较义项：训练、指导（某人或某事物掌握技能）（名词）。

• coach

  Used specifically for someone who trains a person in a sport or skill, focusing on teaching and improving human performance; the standard word for a sports instructor.

  专指训练某人从事体育运动或技能的人，侧重教学和提高人的表现，是体育教练的标准说法。

  The tennis coach spent every afternoon improving her serve.

  这位网球教练每天下午都在帮她提高发球技术。

• handler 本词

  Usually refers to someone who trains and controls an animal, or informally manages a fighter or performer; implies handling and directing rather than general skill teaching.

  通常指训练并驾驭动物的人，或非正式地指为拳手、表演者打理事务的人，强调“驾驭、掌控”而非泛泛的技能教学。

  The dog handler trained the puppy to sit and stay.

  这位训犬员训练小狗坐下和待命。

Coach and handler can both mean someone who trains a person or animal. Coach specifically trains a person in a sport or skill, focusing on teaching and improving performance. Handler usually trains and controls an animal, like a dog, or informally manages a fighter's affairs.

coach 和 handler 都可以指“训练某人或某物”的角色，但 coach 专指训练运动员或学习者提高技能的教练，对象是人；handler 在这一义项里通常指训练并驾驭动物（如训犬员），或非正式地指为某位运动员打点事务、指导比赛的人，语气更偏向“操控、管理”。这里不比较 handler 的“处理人”“操纵者”等其他义项。