And these birds, what I've done is I've complied all the records, all the available records of these birds, put them together, and found out they migrate at exactly the same time as the dragonflies.
所有这些鸟，我所作的就是整理了所有我能找到的 关于这些鸟儿的资料， 把它们放在一起，就发现它们沿着和蜻蜓完全一样的路线 迁徙。