水体复氧规律的研究对于预测和评价水中溶解氧含量，确定有机污染水体的自净过程具有重要意义。
The changing law of re-aeration is of great importance for predicting and evaluating the oxygen content in water and the self-purification process of organic pollutants.
因为污染物除随河水流动方向流动以外，还会向河水流动不同方向扩散。污染物也可能由于水体的自净作用而在流动过程中逐渐消失。
Due to the diffusional effect, the pollutant will flow not only towards the down-stream, but also in other directions, including the direction against the flow stream.
密西西比河水系的水本该在流向下游的过程中自净。
The water in the Mississippi River system should be able to clean itself naturally as it flows down stream.
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