More people live in poverty in vulnerable buildings in crowded cities.
越来越多的人挤在城市的危房里，过著贫苦的生活。
It's very crowded in many cities.
很多城市都很拥挤。
Yes, it's very crowded in many cities.
是的，很多城市都很拥挤。
And there may simply not be enough space in our crowded cities.
又或许这只是因为我们拥挤的城市没有足够的空间。
They not only pollute the air in cities, but make then crowded.
汽车不仅污染城市空气，而且使城市变得拥挤不堪。
Thee traffic in many big cities is getting more and more crowded.
许多大城市的交通正在变得越来越拥堵。
The traffic in many big cities is getting more and more crowded.
许多大城市的交通越来越拥挤。
They not only pollute the air in cities, but make them crowded.
汽车不仅污染城市空气，而且使城市拥挤不胜。
They not only pollute the air in cities, but make them crowded.
汽车不仅污染城市空气，而且使城市拥挤不胜。
应用推荐