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

他甚至看到蜻蜓和豆娘在当天早些候不存在的一条河流中交配和产卵。机翻

2.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。他甚至看到蜻蜓和豆娘河流里交配和产卵，这条河流当天早些候还不存在。