◊ The informal British expression What's (all) this/that in aid of? is used to ask about the purpose of something.…是干啥用的（英国英语非正式表达）
“What's all this rushing about in aid of, then?” [=what's all this rushing about for?] “We're trying to get things ready for the boss's visit.”“这么急匆匆的为啥啊？”“老板来视察我们要做好准备。”