make difference是什么意思?如果有复数difference用加s吗?

make difference关系重大；有所作为；造成差别；有不同之处
It's easy to make money. It's a lot tougher to make difference.
Teachers make difference!
赚钱很轻易。但改变人生很难。老师改变人生。
不能加s

个人感觉是make a difference吧?这是个短语,不加s的,意思是“有所改观,起到作用”通常是指事情往好的情况发展,有所变化变得越来越好