featherless造句怎么写

The male incubates（孵化） the one-pound egg on his feet, covering it with a featherless fold（褶） of skin called a“ brood patch（补片，贴片）.

One morning, however, the son saw an old bird was feeding her big-mouthed-chirping-baby birds which were featherless he felt so much guilty that he repented of having made so many mistakes.