set off set on set out区别set off set on set out这三个词有什么区别?

set off set on set out区别set off set on set out这三个词有什么区别?
set off set on set out区别
set off set on set out这三个词有什么区别?

set off set on set out区别set off set on set out这三个词有什么区别?
set off: 出发,侧重于去某个地方
例句与用法:
If you want to catch that train we'd better set off for the station immediately.
你要是想赶上那班火车,咱们就最好马上动身去火车站.
They've set off on a journey round the world.
他们已经开始环游世界.
set on
v.
攻击, 前进, 怂恿, 使开始
而且这个句子里面不是set on的短语..set表被动.
意思是这东西经常被放在一个被叫做讲坛的突起的舞台上.
set out:
出发,开始,侧重于开始做某事,还有规划,展现的意思
例句与用法:
They succeeded in what they set out to do.
他们打算做的事已经做成了.