这儿的反射镜上镀了一层多层介质膜，因而反射比超过99%。

The mirrors here are coated with a multilayered dielectric film having a reflectance of over 99%.

youdao

这儿的反射镜上镀了一层多层介质膜，因而反射比超过99%。

The mirrors here are coated with a multilayered dielectric film having a reflectance of over 99%.

youdao