Concrete is a mixture of sand and cement.

混凝土是沙和水泥的混合物。

《牛津词典》

The cement should have the consistency of wet sand.

水泥应当具有湿沙的坚实度。

《牛津词典》

In recent years, steel prices decline, while brick, sand, cement and other building materials prices are soaring in price, this is the brick wall on the iron fence has great advantage.

近几年钢材价格下滑，而砖、沙、水泥等建材价格却飞涨，在价格这块铸铁护栏较砖混的围墙就有很大优势。

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This process of combining of water, cement paste, sand and rock creates an awful lot of CO2 gases - which are linked by some scientists to global warming - about five to 10% of the world's total emissions.

BBC: By Ian Hardy