英文成语：To kill two birds with one stone

一石二鸟/一箭双雕

图片来源 http://sotospeak-english.blogspot.com/

例句：By taking my son to the mall, I killed two birds with one stone. I got to do some shopping as well as spend time with him.  

我在去商场接儿子的时候也顺便逛了个街，真是一箭双雕啊