water self purification

基本解释

Water environment impact is related to the style and strength of the activities and with the water areas self-purification ability.
旅游活动对水环境的影响除了与活动方式、活动强度有关外，与水域面积、自净能力亦有显著的关系。
Metabolism coupling of phytoplankton and microorganism is the basis of indicating culture water's self purification ability and keeping it stable.
养殖水体浮游植物和微生物的代谢偶联，是反映水体自净能力，保持水体稳定的基础。
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.
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。

You had a group from Tennessee that had designed this water purification system that was self-generating through a water wheel.
WHITEHOUSE: Backyard Discussion on Women and the Economy