It was caused by local pollution.
酸雨主要是局地污染造成。
The acis rain in china is due to the local pollution of sulfur.
我国酸雨主要是局地性硫污染所造成的。
Waste water from the factory is the main cause of the pollution of local rivers.
来自那家工厂的污水是当地河流污染的主要原因。
Waste water from the factory is the main cause of the pollution of local rivers.
来自那家工厂的污水是当地河流污染的主要原因。
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