单词	backflow
释义	backflow /ˈbakfləʊ / noun [mass noun] The movement of liquid or air back in the direction it was flowing from: when filling the tank, use an anti-siphon device to prevent backflow the valves prevent backflow of blood into the veins... Veins in the legs have valves which normally prevent any backflow of the blood on its way towards the heart. The reverse flow of electricity or "backflow" can injure an unsuspecting utility worker. Install a backflow valve to prevent sewer backup from coming into your home.
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