固定搭配 “set off” 的意思是 “动身、出发，开始一段旅程”。当描述动身所去的地点时，“set off” 后要接介词 “for”，即 “set off for somewhere 动身前往某地”。

例句

If you don't want to get stuck in traffic, you should set off for the beach early in the morning!

如果你不想堵在路上的话，应该一早就动身去沙滩。

I realised that I had forgotten our suitcases half an hour after we set off for the airport. My wife was furious!

我们出发去机场半个小后，我才意识到忘了拿行李箱。我妻子非常生气！

What time are you thinking of setting off for work tomorrow? Could you take me with you?

你明天打算几点出发去上班？你能捎上我吗？