translation.en: Worldwide, there are more than 2,000 firefly species, and these have evolved remarkably diverse courtship signals, that is, different ways to find and attract mates.
translation.zh: 全世界有超过2000种萤火虫的种类， 而它们都衍生了有着明显不同的 求爱信号， 也就是，找寻和吸引伴侣的不同方式。