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问题: a number of 和 the number of 分别是什么意思?有什么区别?

解答:

a (great) number of + 复数名词 ——用复数动词
the number of + 任何名词 —— 用单数动词
A great number of tourists have been to the Great Wall.
The number of students in the computer class is limited to ten.