In this study, we aimed to clarify if gonadotropin is the key hormone responsible for this phenomenon. 在本研究中，吾人拟探讨促性腺激素是否扮演关键的角色。
The placenta, which develops in response to the implantation of an embryo, produces a certain hormone called chorionic gonadotropin. 胎盘是适应胚胎植入而发育起来的结构，它会产生一些激素，叫绒毛膜促性腺激素。
