Controlled cycle ventilation is a new ventilation system. We could increase the effective volume of wind at work face without increasing the total volume of fresh air in the mine.
受控循环通风是一种新型的通风方式，在不提高矿井总的新鲜风量的同时，就能提高工作面的有效风量。
Transaction for an authority of pollutant drainage is an effective economical approach to control the total volume of pollutant.
排污权交易制度是有效实行总量控制的环境经济手段。
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