意思都是“很多，大量”
只能修饰可数名词的：a large/ great/ good number of, a good/ great many, dozens of, scores of, quite a few
只能修饰不可数名词的：a great deal of, a large amount of, quite a little,a large sum of
既可修饰可数也可修饰不可数名词的：plenty of, a lot of, lots of, a large quantity of, a good supply of
但是a number of不能修饰不可数名词。
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