The persistent haze over many of our cities is a reminder of the polluted air that we breathe, over 80% of the world's urban population is breathing air that fails to meet World Health Organisation guidelines.
2019年12月六级真题(第二套)阅读 Section A
柯林斯高阶英汉双解学习词典释义
VERB
污染;弄脏
To pollute water, air, or land means to make it dirty and dangerous to live in or to use, especially with poisonous chemicals or sewage.