这是与小型鱼纲做斗争的光脚男孩，古老的战斗正在进行着。
This was barefoot boy against bantamweight Pisces, and the age-old fight was on.
鱼纲冷血水生脊椎动物中的任意一种，具有鳍、鳃和流线体型，尤指包括。
Any of numerous cold-blooded aquatic vertebrates of the superclass Pisces, characteristically having fins, gills, and a streamlined body and including specifically.
属软骨鱼纲的鱼软骨鱼纲鱼的一种，以软骨骨架和板状鱼鳞为特征，包括鲨、鳐、灰鳐。
Any of numerous fishes of the class Chondrichthyes, characterized by a cartilaginous skeleton and placoid scales and including the sharks, rays, and skates.
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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