此外，附近工厂排放的有毒气体也是主要污染源头。
Moreover, the poisonous gas sent by the nearby factories is also one of the main causes of pollution.
这些问题源头大部分来自粉尘污染源并不足为奇。
Not surprisingly, the majority of dirt seed sources can be traced back directly to this issue.
这些问题源头大部分来自粉尘污染源并不足为奇。
Not surprisingly, the majority of dirt seed sources can be traced back directly to this issue.
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