Maddrell said the sand DAMS had the potential to give up to 3 million people access to clean water in the drylands of Africa, and would be of particular benefit to women.

麦爵尔说，这些砂坝最大限度能为非洲干旱地区的300万人提供清洁水源，尤其有益于妇女。

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And if there is no water, we rub our hands in the sand to clean them.

而且要是没有水的话，我们就在沙里使劲摩手。

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Such as sand not clean (mud high content), sand the fineness modulus too high or too low, also can make the strength of concrete is reduced, and the water increased.

如砂石不干净(泥含量较大)、砂的细度模数过高或过低等，也会使混凝土强度降低、泌水性增加。

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But the Gold Coast can also surprise even the most dedicated beach snob with its sea hazed dunes, warm waves and soft, clean sand.

BBC: Shore thing: Australia��s beach obsession

ConocoPhillips said Wednesday that near 1, 695 barrels of oil soaked soil and sand has been recovered so far with about 900 personnel and more than 30 vessels working on the clean up.

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