a number of和the number of的区别

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a number of和the number of的区别
a number of和the number of的区别

a number of和the number of的区别
a number of是有很多的…,谓语动词用复数形式；
the number of是…的数量,谓语动词用单数形式；
例：A number of students are playing on the ground.
有很多学生在操场上玩.
The number of students is 20.
学生的数量是20人.

a number of表示许多，一些
the number of 表示 ……的数目，例如 the number of books表示书的数目

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