获得各种资格证书的年轻人的数量一直保持不变或者已经减少。

The number of young people obtaining qualifications has remained static or decreased.

《柯林斯英汉双解大词典》

与此同时，患病老年人的数量也在增加。

Simultaneously, the number of sick older people grew.

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也就是说，在技术变革的前沿，年轻人的数量通常会超过老年人。

That is, generally, younger people tend to outnumber older people on the front end of a technological shift.

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Give enough of the vaccine so you have a dose for everybody in the world, or a large fraction of the people.

疫苗的数量,足以让世界上每个人都接种一支,或者让绝大多数人都能接种一支

耶鲁公开课 - 生物医学工程探索课程节选

So at Brown, um, I'd say maybe Asians are fifteen percent, a representative of overpopulation ,

在布朗大学，亚洲人的比例大概是15%，是典型的亚洲人数量过多，

尊重多样化 - SpeakingMax英语口语达人

This was of great concern because the number of polio cases shouldn't go up as the vaccine is being even more actively distributed through the country, so what happened?

这个现象让人担心,因为小儿麻痹症的发生数量,不应该在疫苗全国范围内普及后,反而有所上升,那么到底发生了什么

耶鲁公开课 - 生物医学工程探索课程节选