The serious problem is that the polluted air is hovering over the surface of earth.
严重的问题是被污染了的空气悬浮在地球表面。
Fifth, the surface brought in peripheral agricultural production is polluted.
五是周边农业生产带来的面源污染。
The river is polluted seriously and you can see rubbish drifting on the surface.
这条河污染很严重，你可以看到垃圾漂在水面上。
The river is polluted seriously and you can see rubbish drifting on the surface.
这条河污染很严重，你可以看到垃圾漂在水面上。
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