世界上一些地区的空气质量相当差以至于人们都不能自由呼吸了。

In some parts of the world the air quality is so bad people can no longer breathe freely.

youdao

世界上一些地区的空气质量相当差以至于人们都不能自由呼吸了。

In some parts of the world the air quality is so bad people can no longer breathe freely.

youdao