本论文采用常规生物学方法、显微和超微组织学方法，对中国团扇鳐的年龄和生殖特性进行了研究；

Here, the age and the reproductive characteristics of P. sinensis are studied with common biological method, microstructure and ultrastructure method;

youdao

本论文采用常规生物学方法、显微和超微组织学方法，对中国团扇鳐的年龄和生殖特性进行了研究；

Here, the age and the reproductive characteristics of P. sinensis are studied with common biological method, microstructure and ultrastructure method;

youdao