A check valve (3) can prevent the natural chemical absorption water head of the water head when the manual pump or the mechanical pump stops to work.

止回阀(3)起当手压或机械泵停止工作时能阻止水位差的自然吸药。

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ASTM D570 Standard Test Method for Water Absorption of Plastics scope:this test method covers the detetmination of the relative rate of absorption water by plastics when immersed.

ASTM D570塑料吸水率的标准试验方法简介：ASTM D570包括了塑料在浸水时相对吸水率的试验方法。

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Water absorption is greatly reduced; consequently runoff is increased, resulting in accelerated erosion rates.

吸水性大大降低了；因此，径流增加，导致了侵蚀率的增加。

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Newer balls come with a coating that inhibits water absorption, which isn't the case with older leather balls.

WSJ: Soccer 'Header' Impact Likened to Hard Punch

Absorption is particularly fast in cold water so the Arctic is especially susceptible, and the recent decreases in summer sea ice have exposed more sea surface to atmospheric CO2.

BBC: Arctic Ocean 'acidifying rapidly'

But one effect of that absorption is that it turns the ocean water more acidic.

CNN: Ice shelf collapse: What does it mean?