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。

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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。

youdao