see off的用法：I went to the station to SEE them OFF.I went to the airport to SEE them OFF.我到车站/我到机场 送别 他们。（常说的送人接人，see off是送人-- 看。。。离去）A cat came into the back garden but the dog soon SAW it OFF.猫进了后院（花园），狗很快就把它赶走。--------------------------------------------set off的用法：The smoke SET the fire alarm OFF.烟雾使火警报警器响...
