时不时地，会有一些严重的空气污染事故发生。
From time to time there are serious accidents that pollute the air.
因此，加强突发性环境污染事故应急监测是环境监测中一项重要的工作。
It is a very key work to monitor the emergency accident of abrupt air pollution.
一次又一次严重事故，污染空气。
Time and time again there are serious accidents that pollute the air.
污染空气的严重事故时有发生。
Time and time again there are serious accidents that pollute the air.
船舶溢油事故是造成海洋环境污染的重要途径。
Oil spills from ships are an important source of Marine environment pollution.
船舶溢油事故是造成海洋环境污染的重要途径。
Oil spills from ships are an important source of Marine environment pollution.
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