城镇里中产阶级的数量在增长，但乡村依然非常贫穷。

In the towns the middle classes are increasing in Numbers, but the countryside is still very poor.

youdao

对无人直升机没有大的需求，尽管可用于销售型号的数量在增长。

There has not been a big demand for helicopter UAVs, despite the growing number of models available for sale.

youdao

同时事实是，随着时间推移，能够辨识“危险”面具的乌鸦数量在增长，这说明乌鸦群体在互相学习这一信息。

And the fact that, over time, a growing number of the crows reacted to the "dangerous" masks suggests that flock mates learn from each other.

youdao

One answer, and it's the one that is most widely believed among Greek scholars, is that the growth of population that we have mentioned in connection with the rise of the polis is still working once the polis comes into form.

原因之一是,这个原因是被广大古希腊学者们所接受的,那就是,人口的增长与城邦的数量,在城邦兴起的阶段还是基本一致的

耶鲁公开课 - 古希腊历史简介课程节选