It is evident that the permeability is not a constant. 显然磁导率不是常数。
Left-handed materials are materials that have simultaneously negative permittivity and negative permeability. 左手材料是一种介电常数和磁导率同时为负值的材料。
Rocks have better water permeability than sand. 岩石的透水性不如沙土。
The soft soil is featured by big viscosity, bad water permeability, big water content, low bearing capacity, big settlement and complex soil layers. 软土地基的土质具有粘性大,透水性差,含水量大,承载力低,沉降量大,土层结构复杂等特点。