Congenital preauricular fistula is a common abnormality consequent on deficiency of embryonal development.
先天性耳前瘘管由胚胎发育异常引起。
Embryonal development and histogenesis of gonads were investigated in this study, which were considered as the base for studying pathology of ovarian tumours.
本文观察了胚胎发育与性腺的组织发生，并以此作为研究卵巢肿瘤病理的基础。
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