Beneath this active layer is a second layer called "permafrost", which is frozen all year around, and is impermeable to water.

在这一活跃层下面，是被称为“多年冻土”的第二层，终年冻结，不透水。

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This employs high-pressure pumps to force the water from brine through a membrane that is impermeable to salt.

这种方法需要用高压泵使海水通过一种不能渗透盐的薄膜，从而淡化海水。

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The landfill sits on a natural foundation of London clay which is more or less impermeable.

垃圾掩埋场以伦敦黏土为天然地基，其防渗效果极佳。

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The impermeable membrane is a thick plastic that can contain leaks.

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Landfills without the benefit of a naturally impermeable layer use plastic liners and imported clay.

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Cement forms an extremely strong, effectively impermeable, seal from a thin slurry that can be pumped pretty easily anywhere, and is the ideal material for this purpose ( Cementing).

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