差不多用英语可以表达为 "roughly" 或 "about"。它的来源可能来自拉丁语，其中 "differo" 意为 "差别"，"non" 意为 "不"，和 "totus" 意为 "全部"。因此， "differo non totus" 可以理解为 "不完全相同"。例句如下：

I'm going to be there roughly at noon.

The trip will cost about $100.

We've been working on this project for roughly a year.

The book is about 300 pages long.