a) set off 動(dòng)身,出發(fā),燃放(鞭炮等),使……爆炸(發(fā)出響聲),引起(做某事)
We set off at dawn.
She usually sets off for school at 6:30.
“Stop thief!” cried John and set off after him.
People still set off fireworks in the countryside in Spring Festival.
If the TNT is shaken or roughly handed,it will be set off.
I accidentally pressed the button and set off the alarm clock.
This question set off a discussion.
b) set out 動(dòng)身,啟程,出發(fā),開始,著手,準(zhǔn)備(做某事)