"Comrade Li Yuan, please explain the mechanism behind women's menstruation.",The young man shook his head with some shame. "My fur isn't even enough to talk about, I've only superficially learned three volumes of the Nine Stages Diagnosis Method.",After buying it, I regretted it because I bought too much. Besides the high mortgage, there's no money for decoration yet. The pressure is so great that I can't sleep, so I can only be addicted to watching dramas.。