a number of foreigners visited our school yesterday中为什么用a number of为什么不用the number of?

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a number of foreigners visited our school yesterday中为什么用a number of为什么不用the number of?
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a number of foreigners visited our school yesterday中为什么用a number of为什么不用the number of?
a number of foreigners visited our school yesterday中为什么用a number of
为什么不用the number of?

a number of foreigners visited our school yesterday中为什么用a number of为什么不用the number of?
a number of是说一些~the number of是指xxx的数量 按照语义应该是说一些吧