per.mit.tiv.i.ty
n.（名词）【复数】 per.mit.tiv.i.ties 【物理学】 A measure of the ability of a material to resist the formation of an electric field within it.Also called dielectric constant ,relative permittivity 介质常数，电容率：一种物质抵制在其内部建立的电场能力的量度也作 dielectric constant,relative permittivity
