它的翅膀变得十分沉重，因为它的羽毛长得又浓又厚。

Its wings have become very heavy because of its feathers and grow thick and strong.

youdao

它的翅膀变得十分沉重，因为它的羽毛长得又浓又厚。

Its wings have become very heavy because of its feathers and grow thick and strong.

youdao