Export pump with check valve, it will immediately turn off to prevent reverse flow back high-pressure water pump.

水泵出口装有逆止阀时，它会立即关闭，防止高压水反向流回水泵。

youdao

Because the water reduces the effects of gravity on your body, you can lie on your back to do the backstroke without risking the impaired blood flow such exercises can cause on dry land.

因为水会减轻身体受到的重力作用，你可以躺着游仰泳，从而避免在陆地上做运动引起的血液流动受阻的现象。

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Designed to prevent the flow of contaminated water back into the potable water supply, these devices require no plumbing changes, and screw directly onto a sill cock.

其功能在于防止污染水回流到饮用水供应系统中，这些装置不需要对改变管线，只需要直接螺纹旋在洒水龙头上即可。

youdao

When the water heater is working correctly, water will flow from the storage tank to the collector and back again.

VOA: special.2009.04.20

Rather, as a consequence of injecting water and sand into the shale formation to crack the rocks so gas and oil will flow, massive amounts of waste water comes back to the surface with significant amounts of contaminants as a result of leaching out salt, heavy metals and trace amounts of radioactive materials from the rock formation itself.

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Most of that water stays in the well, but 20% returns to the surface as flow-back in the days and weeks after fracking.

ECONOMIST: Shale gas��s poor image in Europe is largely unjustified