雄鸟和雌鸟轮流孵蛋。Males and females take turns brooding the eggs.该是母鸡孵蛋的时候了.It is time for hens to brood.这些时期，鸟儿会趴在笼底，好像在下蛋或孵蛋。During these periods the birds will lie on the cage floor as if trying to lay or hatch eggs....

“孵蛋”的英语可以翻译为：incubate，incubation ...