Receding gums can be the result of disease or simply incorrect brushing.牙龈萎缩可能是疾病导致的，也可能仅仅是错误的刷牙方式引起的。Thoroughly brush teeth and gums twice daily.每天两次彻底刷净牙齿和牙龈.A bad tooth may cause an abscess on the gums.一颗病牙可使牙床脓肿....
Nora picked up the boy, and gave him a biscuit. "There you are, Lennie, you take the nice biscuit."诺拉抱起那个男孩，给他一块饼干，说：“伦尼，给，拿着这块好吃的饼干。”Suddenly Lennie's eyes centered and grew quiet, and mad.伦尼的两眼忽然发直,人静下来却气得不可开交.Len...