Closure cover system is one of important parts of landfill site construction, it includes landfill gas discharge guiding layer, geotechnical film, drainage layer and plant cover surface soil layer.
封场覆盖系统是垃圾卫生填埋场建设的重要组成部分，覆盖系统包括气体导排层、土工膜、排水层、植被表土层。
Duricrust is a hard layer on or near the surface of soil.
铝铁硅钙壳是土壤表面或其附近的一层硬物。
Thatch can be described as the layer of organic residue located immediately between the sward and the soil surface.
土壤腐殖质层可被定义为在草皮与土壤表面之间的一层有机残留物。
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