noun 다운로드 🔗공유 납막 A waxy protuberance at the base of the upper beak in certain birds. Examples : "The budgerigar's ceres was a vibrant blue, indicating it was a male ready to breed. " 잉꼬의 납막은 생생한 파란색이었고, 이는 번식할 준비가 된 수컷임을 나타냈다. animal bird anatomy part biology AI와 채팅어휘 게임독해 연습