To counter the feature of overlaying in thin layer , this paper introduces the choice of asphalt mixture gradation used in the covering of pavement of Shi-An Espressway.

针对薄层罩面的特点 ，介绍了石安高速公路罩面沥青混合料级配的选择方法。

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In the process, construction companies are draining wetlands and covering formerly vegetated soils with asphalt, concrete and housing materials.

兴建过程中，建商会排干湿地，将沥青、混凝土、房屋建材覆盖在原本生长植物的土壤上。

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It recommends collecting DU fragments, covering contaminated points with asphalt or clean soil, and keeping records of contaminated sites.

BBC: UK to aid Iraq DU removal