train 作为动词‘ 培训’ 时
train as +表示职业的名词；
train for +表示职业外的其它名词,如
We shall enroll people to train as teachers.
我们要招收一些人来培训为教师.
Runners train for races.
赛跑者为比赛而锻炼.
They trained her for nursing.
他们培训她做护理工作.