病人:我的牙齿对冷特别敏感。Doctor:There ’ s quite a bit of erosion . Which way do you brush your teeth?医生:你的牙齿上有许多腐蚀的地方。你用什么方法刷牙?Doctor:Oh,up and downis better . The way you are doingit rubs all the natural enamel off,you know ..医生:噢,上下刷较好。像你那种刷法很容易将牙釉质刷掉。医生:今天我在腐蚀的地方 ......