Deposits of plaque build up between the tooth and the gum.牙齿和牙龈之间会滋生牙斑。I was in agony with tooth ache.我牙疼极了.Objective : To study the stress tooth preparation with two kinds of porcelains.〔摘要〕目的: 研究瓷贴面复合体应力分布规律.The dentis...
The policemen kept blackmailing him, because they had sth . on him.那些警察之所以经常去敲他的竹杠是因为抓住把柄了.He told her their affair would have to stop, because Jack Smith was blackmailing him.他告诉她说他们的婚外情必须结束了，因为杰克·史密斯正在敲诈他。The crime syn...