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1·Sandstones generally make good aquifers, while finer-grained mudstones are typically impermeable.

砂岩通常是良好的含水层，而细粒泥岩通常是不透水的。

2·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。

3·The canoe is made from an impermeable wood.

该独木舟用防水木材制成。《柯林斯英汉双解大词典》

4·Impermeable rocks are referred to as aquicludes.

不渗透的岩层都称为隔水层。

5·Impermeable clay limits downward percolation of water and fulvic acids, reducing chemical weathering and podzolization.

不可渗透的粘土限制了水和黄腐酸的向下渗透，从而减少了化学风化和土壤灰化作用。

6·Rocky or impermeable sites should be avoided.

多岩石和不具渗透性的地点应当避免。

7·Thus clays and shales tend to be impermeable.

因此粘土和页岩就往往不透水。

8·Thus clays and shales tend to be impermeable .

因此粘土和页岩就往往不透水。

9·Cover work surfaces with disposable impermeable materials.

用一次性防渗透材料覆盖工作台面。

10·Impermeable soil can also prevent drainage, leading to root damage.

防渗土还可以防止排水，导致根损害。

(1)impermeable layer不透水层；防渗层

(1)impermeable barrier不透水层；不透水煤柱；不渗透边界