1·The impermeable layer has aged, we must find someone to repair it.
渗层已经老化，要请人来修理了。
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·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。
4·Particularly, the solution for impermeable silt-layer can be used to describe the tidal fluctuation in a confined aquifer under a tidal river separated by an impermeable layer.
特别地，当边界淤泥层为隔水层时，本文的解也可用来描述有潮河流下的承压含水层中的水头波动情况。
5·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。
6·A painless pulse of electricity can drive drugs, which tend to be charged, through the impermeable outer layer of the epidermis and into the blood vessels of the dermis.
无痛的电流脉冲可以趋使药物(通常会带电荷)穿越不通透的表皮外层，进入真皮层的血管。