Wavelength refinement 谁能帮忙翻译一下？

Wavelength refinement: Dielectric and permeable materials influence the wavelength of the electromagnetic fields. With this setting, the mesh density for the affected structures will be adjusted according to this effect
Low frequency refinement: The mesh density is set depending on the material parameters. Higher permittivity or permeability leads to moderately finer meshes. Prefer this option in case that high dielectric / permeable materials are involved if you want to avoid an unnecessarily fine mesh.

谁能帮翻译一下,并解释一下,具体条件的使用,如果介质电常数比较高(介质谐振器,在自由空间当中,平面波激励仿真)用那个?
谢谢！

自己查查词典久可以了哈