不透水层

watertight layer的用法和样例：

例句

Landfills without the benefit of a naturally impermeable layer use plastic liners and imported clay.没有受益于天然不透水层的垃圾填埋场使用塑料衬管和进口粘土。
A mathematical model for groundwater pollution in a leaky aquifer system,which involves the adsorption of semipervious layer,is presented.提出了一个越流含水层系统考虑弱透水层吸附作用的地下水污染数学模型。

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boost regulator