训练某人做某事
train sb to do sth
   2.train sb to do
   例如：出于怜悯为某人做某事.
   Do
sth out of pity
for sb.    训练某人做某事
train sb to do sth
   2.train sb to do
   例如：出于怜悯为某人做某事.
   Do
sth out of pity
for sb.