如何使用 "nigrescent" 造句

1. How to often brush vi babble to return nigrescent ah ?
经常刷牙牙怎么还发黑啊?
2. Head of head of your that fellow is nigrescent , return child !
你那家伙头头都发黑啦,还小孩子呢!
3. One of these day small go by force on the road , an old man pulls him say : youngster , you imprint hall is nigrescent , be afraid there is a fatal disaster recently !
某天小强走在路上,一位老者把他拉住说:年青人,你印堂发黑,恐怕最近有杀身之祸!