back tooth

Since a back tooth is bad , it became swollen .

后牙齿坏了，肿了起来。

What ? The government pays for stuff like this , and I can 't get my back tooth fixed ?

什么，政府花钱补助这种玩意儿，而我连补大牙的钱都没？

When designing gear hob , worm gear hob and shaping milling cutter , it should be verified whether the interfere would occur between grinding wheel and the next gear tooth on condition of pledging the relief grinding length of the back of tooth .

在设计齿轮滚刀、蜗轮滚刀和成形铣刀时，要校验在保证齿背铲磨长度的情况下，所用砂轮是否和下一个齿发生干涉。

This paper uses the Finite difference method to study the responding temperature value of the tooth back when the tooth is quenched by laser and gives the relation charts of temperature value with laser parameters and gear parameters .

针对齿轮激光表面淬火背面回火现象，采用有限差分法分析研究了背面温度响应值，并给出了温度响应值与激光工艺参数、齿轮参数的关系线图。

Make sure you brush the top , front and back surfaces of each tooth . Don 't forget your back molars .

确保刷到每一颗牙齿的顶部和前后表面。不要忘记磨牙。