set off: 出發(fā),側(cè)重于去某個地方
例句與用法:
If you want to catch that train we'd better set off for the station immediately.
你要是想趕上那班火車,咱們就最好馬上動身去火車站.
They've set off on a journey round the world.
他們已經(jīng)開始環(huán)游世界.
set on
v.
攻擊, 前進(jìn), 慫恿, 使開始
而且這個句子里面不是set on的短語..set表被動.
意思是這東西經(jīng)常被放在一個被叫做講壇的突起的舞臺上.
set out:
出發(fā),開始,側(cè)重于開始做某事,還有規(guī)劃,展現(xiàn)的意思
例句與用法:
They succeeded in what they set out to do.
他們打算做的事已經(jīng)做成了.