permittivity dispersion的用法和样例：
例句
- Relative dielectric permittivity and loss angle tangent among them are the two of most important indexes.
相对介电常数和介质损耗角正切是其中的两个重要的性能指标。 - 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。
