unpermeable layer的用法和樣例：
例句
- Landfills without the benefit of a naturally impermeable layer use plastic liners and imported clay.
沒有受益於天然不透水層的垃圾填埋場使用塑料襯管和進口粘土。 - A mathematical model for groundwater pollution in a leaky aquifer system,which involves the adsorption of semipervious layer,is presented.
提出了一個越流含水層系統考慮弱透水層吸附作用的地下水污染數學模型。
