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http://www.quora.com/Menstruation-and-Menstrual-Hygiene-Management-MHM/What-is-the-evolutionary-benefit-or-purpose-of-having-periods
您即将离开知乎,请注意您的帐号和财产安全。
http://www.quora.com/Menstruation-and-Menstrual-Hygiene-Management-MHM/What-is-the-evolutionary-benefit-or-purpose-of-having-periods