background pollution造句

"background pollution"是什么意思

造句与例句手机版

Background pollution occurs in areas not directly affected by pollution sources.
The marsh at the bottom of the lands has been used in film documentaries, as it is the only place in Cumbria where there is not " background pollution ".
It's difficult to see background pollution in a sentence. 用background pollution造句挺难的

相邻词汇

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