set off on \set off for\set off doing 意义的差别另 set off 到底有没有着手做某事的意思

set off on \set off for\set off doing 意义的差别另 set off 到底有没有着手做某事的意思
set off on \set off for\set off doing 意义的差别
另 set off 到底有没有着手做某事的意思

set off on \set off for\set off doing 意义的差别另 set off 到底有没有着手做某事的意思
set off 是固定搭配,至于后边的借此要看句子成分.
set off 出发,动身,启程.
set sth off 引发,触发某事
偏向于动身,出发,一般不指具体做某事
具体做什么是 set about doing sth