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。
The partial arc may derive from the surface of polluted insulator string and form the air gap arc during the pollution flashover process at low air pressure.
低气压下绝缘子污闪放电过程中局部电弧存在飘离绝缘子表面形成空气间隙电弧的现象。
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。
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