pollution
US /pəˈluː.ʃən/
UK /pəˈluː.ʃən/
1.
污染
the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.
:
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Air pollution is a major concern in big cities.
空气污染是大城市的一个主要问题。
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Water pollution affects marine life.
水污染影响海洋生物。