1·The theory had been confirmed in the experiment with small animals, but none test have been done by using large mammalia.
该理论在小体积动物实验中已得到证实，但在大型哺乳类动物中进行的此类实验还未见报道。
1·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.