utilise /use 和 employ 有什么区别？如果难以说明的话，请教我一下例句。

Utilize = use - they are exactly the same. Employ just means “make use of,” so it is almost the same as use/utilize. You can pretty much use all of them interchangeably. Employ is just usually more fancy.

What methods have you employed to collect the data?
What methods have you used to collect the data?
What methods have you utilized to collect the data?