He even saw dragonflies and damselflies mating and laying eggs—at a river that had not existed earlier that day.

看到蜻蜓豆娘在当天早些候不存在的一条河流中交配。

Within a few hours, Bogan counted seven different species of dragonflies. He even saw dragonflies and damselflies mating and laying eggs-at a river that had not existed earlier that day.

几小内，博根数出了七种不同种类的蜻蜓。看到蜻蜓豆娘河流里交配，这条河流当天早些候还不存在。