监测结果显示：整条江水质呈现出轻重不一的污染段面。
The result indicated the whole river was divided into several sections of different pollution level of water quality.
尽管我们已经做了很多工作来解决空气污染问题，但它在很长一段时间内仍将是一个问题。
Air pollution will remain a problem for a long time, though we have done a lot to solve it.
而且这还不是所有。王先生表示在这个城市的污染的趋势一段时间里一直在下降。
And that's not all. Mr Wang says the trend for pollution has been down in the city for some time.
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