translation.en: 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.
translation.zh: 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。