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·Yet the methods of culturing and studying human cells have traditionally been carried out in two dimensions on flat impermeable surfaces.
然而传统的人类细胞培养与研究是在不透水的二维平面上进行的。
3·Do not cover the mower with impermeable materials - such as plastic sheets.
不要用塑料布等不透水材料覆盖割草机。
4·Water may condense under impermeable materials and cause corrosion of metal parts of the mower.
水可能会在不透水的材料上冷凝并造成割草机的金属部件锈蚀。
5·When confined aquifer under the bottom of the pit, the foundation excavation will reduce the thickness of overlying impermeable layer.
在基坑底部以下存在承压水层的情况下，基坑开挖减少含水层上覆不透水层的厚度。
1·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。
2·Design of impermeable layer is the central issue; construction should guarantee the design requirements with the highest quality.
设计的核心内容是防渗层，对施工的要求是要确保高质量地满足设计要求。
3·The impermeable wall is the most efficient method to deal with leakage. The impermeable wall which is rational designed will improve the seepage state of levee projects effectively.
合理设计的防渗墙能有效地改善堤防工程的渗流状态，是最为有效的防渗处理方法。
1·In certain preferred embodiments, the flexible graphite shell is fluid impermeable.
在某些优选实施方案中，该柔性石墨罩壳是流体不可渗透的。
2·The air filter 18 May also be sized such that the filter frame 18b is force-fit into the filter box 22 such that the area between the air filter 18 and the filter box 22 is nearly air impermeable.
空气过滤器18也可以具有使得过滤器框架18b被过盈配合进过滤器盒22的尺寸，以便空气过滤器18和过滤器盒22之间的区域使得空气几乎是不可渗透的。