求助less than 和fewer than的区别

各位大虾，

向大家求助：less than和fewer than的区别，是不是仅仅是：一个修饰不可数名词，一个修饰可数名词

谢谢

another difference: "less" acts as a noun, while "fewer" can not. I can't remember the exact question in OG,you can check it by yourself. By the way, I am not NN, just a novice.