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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Clothing that is impermeable to water prevents the evaporation of sweat from the skin.

穿着不透水的衣服会阻碍体表汗液的蒸发。

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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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However, the shale rock containing natural gas is separated from underground water aquifers by impermeable layers of rock that do not allow any hydraulic fracturing fluids to migrate into underground water aquifers.

FORBES: The Sierra Club Fails An Environmental Consistency Test