Concrete is a mixture of sand and cement.

混凝土是沙和水泥的混合物。

《牛津词典》

Builders have trouble getting the right amount of cement into their concrete.

建筑工人们不知道该往混凝土中加入多少水泥才合适。

《柯林斯英汉双解大词典》

Several soldiers mix cement on the street, lifting it up to their colleagues who use it as mortar, placing a concrete block on top of concrete block.

几名士兵在街道上混合水泥，举给同事们当砂浆用，累砌混凝土块。

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The National Ready Mixed Concrete Association points out that using ash in cement is not a new idea.

VOA: special.2009.12.01

And so, when you think about how much cement concrete are consumed annually on the planet, this becomes a considerable point source of greenhouse gas emissions.

当你想到,在地球上每年要消耗多少的水泥混凝土的时候,这将是温室气体排放的,一个主要来源。

麻省理工公开课 - 固态化学导论课程节选

Portland cement is a material that holds together the sand and crushed stone in concrete.

VOA: special.2009.12.01

Yet noble intentions do not, of themselves, move concrete, even rotting concrete like the cement-and-pine-cone slurry used to make the Elwha Dam, the first of the two structures to be built.

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Quinn Building Products supplies cement, concrete, roof tiles and other quarry products from plants at Ballyconnell in County Cavan and Derrylin in County Fermanagh.

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In the harshly worded order, the judges said that failure to punish such dishonest acts would destroy the moral fibre of society, a national asset of greater importance than cement and concrete.

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