牙斑如果不清除就会导致牙齿蛀蚀和牙龈疾病。When not removed, plaque causes tooth decay and gum disease.牙齿和牙龈之间会滋生牙斑。Deposits of plaque build up between the tooth and the gum.需刷牙以去除牙斑.It is necessary to remove plaque by brushing one's tee...
They brought pineapples and huge bunches of bananas.他们带来了菠萝和大串大串的香蕉....bunches of violets in twists of paper...纸卷包裹的一束束紫罗兰She clutches the sides of her skirt until it bunches around her waist.她捏着裙子的两侧，直到裙子在她腰部打起了褶。Vehicl...
Objective: To summarize the experience of treatment for mediastinal emphysema ( ME ) and analyse the etiopathology.目的: 探讨纵隔气肿的发病机理,总结其治疗经验.AimTo summarize the experience of surgical treatment of pneumomediastinum and to ...