Amniotic eggs allowed them to flourish in the drier conditions 蛋能使它们在干旱的环境下兴旺发展
in a way that amphibians could not. 在干旱的土地上繁衍
that held the embryo in its own private pool of fluid. 将胚胎保护在“私家泳池”之中
No matter what great heights amphibians reached in their conquest of land... 不论两栖动物 在征服陆地的过程中达到如何的高度
A female laying eggs in the water. 一只雌性蜻蜓在水上产卵
dragonflies in flight can be just too hard to catch. 飞行中的蜻蜓仍然很难捕获