城市污水处理率：指经管网进入污水处理厂处理的城市污水量占污水排放总量的百分比。
... 先天与后天，遗传与环境 nature-nurture 城市污水处理率 treatment rate of domestic sewage 集中处理厂 centralized treatment plant ...
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从2001年以来，城市污水处理率提高了一倍。
中国已建有420座污水处理厂，城市污水处理率达30%以上。
There are 420 wate water treatment plants in China and the treating ratio of urban waste water is more than 30%.
随着我国城市污水处理率的逐年上升，活性污泥法的应用越来越广泛。
Activated Sludge Process is applied more and more extensively, with rate of treated sewage rising.
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