Trainer

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wiktionary

ref 

train +‎  -er


etymonline

ref

trainer (n.)

c. 1600, "one who educates or instructs," agent noun from train (v.). Meaning "one who prepares another for feats requiring physical fitness" is from 1823, originally of horse-trainers.

取自“https://www.bigphysics.org/index.php?title=Trainer&oldid=23581”