鸵鸟的排泄行为与其它鸟纲动物有明显的区别。
The excretion behavior of African ostrich was remarkably different from that of other birds.
目的：了解鸟纲蜗管听毛细胞突触的超微结构。
Objective: to understand the ultrastructure of the synapses of the auditory hair cells in avian cochlea.
麻雀，曾为四害，鸟纲雀形目文鸟科麻雀属鸟类的统称，灰头土脸幻想涅槃。
Sparrow, the small wild bird, once denounced one of the Chinese four pests, the general title of the family Passeridae, with ashed apperance dreaming of fantasy nirvana.
使用“生殖上皮”这一概念，一定程度上将鱼纲和鸟纲，哺乳纲的性腺发育统一起来，便于比较它们的异同。
By using the concept of "germinal epithelium", the researches on the gonadal development of Pisces, Aves and Mammalia were unifying to some extent then their characters were convenient for compared.
使用“生殖上皮”这一概念，一定程度上将鱼纲和鸟纲，哺乳纲的性腺发育统一起来，便于比较它们的异同。
By using the concept of "germinal epithelium", the researches on the gonadal development of Pisces, Aves and Mammalia were unifying to some extent then their characters were convenient for compared.
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