It was made from a ruby crystal, some lamps and 2 mirrors, one on either side of the crystal.

它由红宝石水晶、一些灯和 2 面镜子制成，水晶的两侧各有一面。

They all have an energy source, such as a lamp, some sort of feedback mechanism, like this pair of mirrors, and also some medium, like the ruby crystal, which can amplify the light.

它们都有一个能源， 比如一盏灯， 某种反馈机制，比如这副镜子， 还有一些介质， 比如红宝石水晶， 可以放大光线。