The main star is an enzyme called luciferase, which in the course of evolution has figured out a way to wrap its tiny arms around an even smaller molecule called luciferin, in the process getting it so excited that it actually gives off light.
主要的亮光来自一种荧光素酶， 萤火虫在漫长的时间中进化出一种方法， 用一种叫荧光素的更小的分子， 包裹住自己的小脚， 这个过程中是那么剧烈， 以致于有了光的发散。