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。

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At Community Solutions, risking failure within a controlled testing cycle is a critical part of our social problem-solving process.

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For three decades it controlled the innovation cycle.

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