... 不透水岩层 impermeable rock bed 不透水岩系 impermeable system 不透水性 impermeability ;imperviousness ;tightness ;unpermeability ...
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Geomembrane impermeable system 土工膜防渗结构
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The ground with regular accumulated liquid shall be impermeable and the wastewater of slope direction sewer age system shall be collected by production and repair wastewater gathering system.
经常有积液的地面不透水，并坡向排水系统，其废水纳入生产、检修污水收集系统。
youdao
No system is completely impermeable, I think everyone would accept that.
BBC
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