Feminine menstruation does not consider lunar a solar month of 31 days small , be number calculating a day , be 30 days are a cycle normally , but sometimes hou huichi a few days , sometimes hou hui is early a few days 女人的月经不算月大月小的,是算天数的,通常是30天为一个周期的,但有时侯会迟几天,有时侯回早几天的
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