单数
the number of用法：
the number of表示“.....的数量”跟复数名词连用作主语时,中心词是number,谓语动词要用单数.例如:
Theis50number ofstudentsin ourclass
我们班学生的数量是50人。
Thenumber ofin this book is60.pages
这本书有60页。
the number of例句：
The new digital technologywouldallowrapidaexpansionin thenumber of TV channels.
新的数字技术将会使电视频道的数量迅速增加。
The firststubborn problem wasreductions in theand mostthat ofnumber ofaircraft.
最首要也是最棘手的问题是飞机数量的减少
International rules stipulateforeignthe number ofentrants.
国际规则规定了外国参赛者的人数
qualificationsThe number of youngpeopleobtaininghasremainedstatic ordecreased.
获得资格证的年轻人数量一直维持不变或出现下降
拓展知识：
1.The number of students in the classroom is 30.
2. The number of cars on the road during rush hour is overwhelming.
3. The number of books in the library is impressive.
4. The number of people attending the concert was staggering.