set out 和 set off 区别?

set out和set off都有出发的意思,区别:set off更含开始(旅行、赛跑等）的意思,例：what time are you planning to set off tommorrow?你明天打算几点钟启程?they've set off on a journey round the world。他们已经开始环游世界。set out意思是从某地出发上路 例：she set out at dawn。她天一亮就动身了。另外,set out to do sth是开始／着手干某事而,set sb off doing sth是使某人开始干某事