A number of 跟 The number of 的区别
2个回答

a number of =a lot of =lots of表示许多,跟可数名词复数,谓语动词用复数形式 the number of某某的数量是多少,谓语动词用单数

如:

A number of people walk on the street.

The number of people in ther street is large.