much 修饰比较级,意思是“……得多”;much 也可修饰不可数名词,意思是“许多的”
many 只能修饰可数名词复数,不能修饰比较级,所以不存在区别。
如:
He runs much faster than his brother .
他跑得比他哥哥快得多。
There is much water over there.
那边有太多水。
There are many books in the library .
图书馆里有许多书。
拓展:
常见修饰比较级的词有:much , far , a little , even , still 等