The passing of water or other liquid through a filter in the reversedirection to normal flow in order to flush it clean;
水或其他液体从正常流向的反方向流过一个过滤器，将其冲洗干净；
The passing of water or other liquid through a filter in the reversedirection to normal flow in order to flush it clean;
水或其他液体从正常流向的反方向流过一个过滤器，将其冲洗干净；
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