downward filtering process
... downtown市中心；城市商业区（美） downward filtering process下滤过程 downwelling沉降流 ...
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在过滤过程中，一旦容器被充满，在压力下滤液通过滤布到出口管道。
During the filtration process once the vessel is filled and under pressure filtrate passes through the cloth and into the outer tubes through the slots.
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