When menstruation comes why is blood red gotten nigrescent?

月经来的时候为什么血红得发黑?

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Labial color is darker, nigrescent reason?

嘴唇颜色比较暗, 发黑的原因?

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Incinerate fertilizer volatilizes nigrescent meeting flying.

灰化肥挥发发黑会飞花.

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How to often brush vi babble to return nigrescent ah?

经常刷牙牙怎么还发黑啊?

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