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月经是女子性发育成熟后至绝经期之前,子宫内膜周期性的生理变化引起的现象。这种少量的出血,意味着周期性地排出卵子,分泌激素,维持女性特征及生育功能。丰满、圆润的乳房,是性成熟女子特有的形体表现,是女性第二性征的重
Menstruation is a phenomenon caused by the cyclical physiological changes of the endometrium before menstruation develops from the sexual development to the menopause. This small amount of bleeding means that eggs are periodically released, hormones are secreted, femininity and reproductive function are maintained. Plump, rounded breast, is the unique physical performance of mature women, women are secondary to the weight of