The spread of all educational theories and science knowledge of the school often must put in practice through the main channel of the practical class teaching.
学校的一切教育理论和科学知识的传播，往往都必须通过实际的课堂教学的主渠道来实施。
When the pump is normal work, but through the valve and pump water loop truncate the channel impeller, and put off the liquid water ring round.
当泵正常工作后，可通过阀截断水环轮和水泵叶轮的通道，并且放掉水环轮内的液体。
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