adj. staunch ; water-proof ; watertight ; waterproof
misc. hydrofuge
砂岩通常是良好的含水层，而细粒泥岩通常是不透水的。
Sandstones generally make good aquifers, while finer-grained mudstones are typically impermeable.
鸡蛋的外壳是不透水的，防止胚胎失水。
The outer covering of the egg is waterproofed to prevent the embryo from drying out.
穿着不透水的衣服会阻碍体表汗液的蒸发。
Clothing that is impermeable to water prevents the evaporation of sweat from the skin.
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