when it comes to sth，意旨真谛是：当触及某事时，当说到某事时开云体育(中国)官方网站，在某个方面。

比如：

There's nothing she doesn't know when it comes to computers.说到电脑，莫得她不知谈的事。简略翻译成：在电脑方面她无所不知。

When it comes to fishing, John is an expert.在垂钓方面约翰很在行。

When it comes to math, she is an expert. 当谈到烹数学时，她是个众人。

Dad is a pretty smart guy in general but when it comes to common sense, sometimes I wonder about him.爸爸一般情况下很颖慧，当触及知识时，随机我对他感到诧异。

备注：截图来自《小屁孩日志》（DIARY of a Wimpy Kid）