通过砂坝底下建造地下管道或者在沙中开挖蓄水洞，便可以在雨后连续几个月内抽取这些自然净化过的水。

Clean water can be drawn for up to several months after the rains have fallen through pipes underneath the DAMS or by digging a hole in the sand.

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自然堆积的灰质鲕粒砂具有40%的孔隙度，因为其颗粒其本上都是球状的。

Oolite lime sand packs naturally with 40 % porosity because the particles are essentially spheroides.

youdao

自然堆积的灰质鲕粒砂具有40％的孔隙度，因为其颗粒其本上都是球状的。

Oolite lime sand packs naturally with 40% porosity because the particles are essentially spheroides.

youdao