retardation coefficient

例句：

1. 1. The coefficient of friction betweenthe two materials is very low, whichmakes it difficult to move them together.
   两种材料的摩擦系数非常低，这使得它们难以一起移动。
2. 2. Thecoefficient of thermal conductivityis a measure of how quicklyheat can be transferred through a material.
   热导率系数是衡量热量通过材料传递速度的指标。
3. 3. Thecoefficient of refractiondetermines how light bendswhen it passes through a medium withdifferent refractive indices.
   折射率系数决定了光线在穿过具有不同折射指数介质时发生弯曲的程度。