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。

It insists that the chinese walls separating its traders and bankers are always impermeable .

它强调将贸易部与银行部分隔开的职能分隔制度一直是保密性良好的。

Landfills without the benefit of a naturally impermeable layer use plastic liners and imported clay .

没有自然的防渗透的隔离层，垃圾填埋作业就使用塑性衬套和进口的泥土。

Of such close construction as to be impermeable .

结构紧密以至不透水的。

Fracking takes place thousands of feet below the water table , and fracking zones are typically separated from groundwater by fairly impermeable rocks .

水力压裂在水床以下几千英尺处进行作业，而且通常都会用不透水岩将水力压裂作业区和地下水区域隔离开。