when it comes to…是英语中的惯用句式，意思是“说到……”“谈到……”。其中的 to 是介词，其后接名词或代词，若接动词，则要用动名词。如：

She's hopeless when it comes to money. 说到钱的问题，她一窍不通。

Charo is no match for her mother when it comes to cooking. 说到做饭， 沙罗根本就没办法和她妈妈相比。

I am out of my depth when it comes to natural sciences. 一谈到自然科学我就茫然不知。

I’m no match for her when it comes to painting. 说到绘画，我远远不如她。

I just seemed to block when it came to taking a test. 一到参加测验，我就好像卡壳了。

His past achievements were of no account when it came to competing with the younger men. 要说跟年轻人竞争，他过去的成绩就不值一提了。