The muddle over how to limit water pollution from a refinery, which at least is easy to identify, does not bode well.

不知如何限制精炼油厂污染水源并不是一个好兆头，因为至少这种污染源点是容易确定的。

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This study also researches the ecological system of Chengdu city. The history data shows that the pollution emission of Chengdu is over the limit badly.

之后，本文通过水质分析对成都市的生态系统进行了研究，实测数据显示成都市污染物排放严重超标。

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