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.
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.
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.
应用推荐