pollution

US /pəˈluː.ʃən/
UK /pəˈluː.ʃən/
"pollution" picture
1.

污染

the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.

:
Air pollution is a major concern in big cities.
空气污染是大城市的一个主要问题。
Water pollution affects marine life.
水污染影响海洋生物。