And some watches that glow in the dark work in a completely different way, through 'radioluminescence'.

一些在黑暗中发光的手表的原理是完全不同的，它们通过辐射发光。

But radioluminescence is rarely used nowadays because engineers are developing better photoluminescent compounds for watches as well.

但是现在很少使用辐射发光，因为工程师也在为手表开发更好的光致发光化合物。