Rocky or impermeable sites should be avoided.

多巖石或不易滲透的地區(qū)應(yīng)當(dāng)避免。

Oil is usually found in porous rock under a layer of impermeable rock which prevents it from escaping.

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The fast cooling packaging is absolutely impermeable to light and oxygen and at the same time ensures a reliably authentic taste.

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A 10-cm-long impermeable sleeve was used to line the duodenum and upper jejunum of rats.

10厘米長的防滲袖子被用來評估對十二指腸和空腸上的影響。

As another example, the border between deciduous forest and wildflower prairie in the midwest is remarkably impermeable.

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Landfill impermeable liner investment counts more than 30% of total landfill construction investment.

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Inadequateness leads to thin artificial barrier, which cannot form a low permeable or impermeable artificial barrier, which just cause lower differential pressure, this cannot control the extension on the height effectively.Moreover, because the artificial barrier cannot achieve the function of the height controlled, finally make the projection less efficiency, even could be defeated comes to an end.

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Based on the small steepness parameter, three-layer incompressible, inviscid and irrotational fluid system of arbitrary depth is discussed by using the perturbation method, and a unified theory of nonlinear interfacial-internal wave propagation and the approximate nonlinear evolution equations for interfacial-internal elevations are given on the basis of the rigid upper boundary and the flat impermeable bottom.

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Numerous impermeable underground structures exist in urban seepage field. Since the corner of the structure is singular point and the dimension of the structure is negligibly small compared with the whole urban seepage field, it is difficult to model seepage field in urban area with existing methods.

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