This impervious layer or boundary will retard the free diffusion of moisture. This condition is referred to as case hardening.
这一不透气的壳层(或边界层)会阻滞水分自由扩散，这种情形称为表面硬化。
In these pits shops specialized channels, and impervious layer, used for the collection of refuse from fermentation gases and leachate.
在这些坑中铺有专门的管道和防渗层，用来收集垃圾发酵产生的气体和渗滤液。
In these pits shops specialized channels, and impervious layer, used for the collection of refuse from fermentation gases and leachate.
在这些坑中铺有专门的管道和防渗层，用来收集垃圾发酵产生的气体和渗滤液。
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