nigrescent的中文翻译是什么意思

When menstruation comes why is blood red gotten nigrescent?

月经来的时候为什么血红得发黑?

How to often brush vi babble to return nigrescent ah?

经常刷牙牙怎么还发黑啊?

Labial color is darker, nigrescent reason?

嘴唇颜色比较暗, 发黑的原因?

Incinerate fertilizer volatilizes nigrescent meeting flying.

灰化肥挥发发黑会飞花.