他们坐在一个空中的房子里，房子和他们一起在空中飞行。
They sat in an aerial dwelling, and it flew with them through the air.
随着时间的推移，羽毛变得越来越大，扑翼飞行逐渐发展，鸟类最终完全可以在空中飞行。
As feathers became larger over time, flapping flight evolved and birds finally became fully air-borne.
它们可以在空中飞行，漂浮在水里，还可以休眠好几个月。
They could travel through the air, float in water, and lie dormant for many months.
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