The best profile for tooth back of the relieving shaped milling cutter is firstly presented in theory.

用成形铣刀铣螺旋槽时，求成形铣刀廓形的问题是个求解空间啮合运动的理论问题。

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This system can optimize the parameter of gears, check relief grinding of tooth back automatically and design the gear hobs rapidly and reliably.

该系统可优化滚刀设计参数，自动校核齿背铲磨，实现齿轮刀具快速可靠的设计。

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Hold the floss tightly against the tooth, and move it away from the gum. Slide it firmly down the tooth surface, combining this with a back-and-forth motion.

牙线紧紧地贴着牙齿，往上向远离牙龈的方向移动，再沿着牙齿邻面向下移动，把这个动作跟牙线的前后移动组合在一块。

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"We are going to go back in and fight this thing tooth and nail, " Gorman said.

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They would start to cut back, and change orders, and fight you tooth and nail for every cent.

NPR: Texas Family's Money Woes Began At Gas Pump

Housing stocks have been moving mostly higher dating back to last October, leading to concerns that the rally is getting long in the tooth.

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