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。
Not only do they have a sharpened peg of a tooth but their teeth narrow down to a razor sharp edge at the back making the tigers bite much more lethal.
它们不仅仅有锋利的三角状牙齿，而且背面向下逐渐收缩成剃刀一样锋利，这使得老虎的咬更加致命。
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。
She still wrote to Karl and he wrote back Helen had a tooth, Aiko's English was improving, Karl had lost weight.
她继续写信给卡尔，卡尔也回信给她海伦长了颗牙，爱子的英语有进步，他自己的体重减轻了。
The tooth comprises a winding support integrally molded with the back iron the face.
所述齿包括与所述 护铁和所述面模制成一体的绕组支座。
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。
The back iron is removably attached to the second end of the tooth body and adjacent stator segments are spaced by interfaced adjacent back iron.
护铁可拆卸地附连到所述齿主体的第二端并且相邻定子节段由对接相邻护铁间隔。
I took the dog around the block to get out of the house, and I came back to see her leaving her room... my electric tooth brush in her hand.
我带着狗出去遛了遛。我回来的时候正巧碰见她出来，手里拿的东西是——我的电动牙刷。
I took the dog around the block to get out of the house, and I came back to see her leaving her room... my electric tooth brush in her hand.
我带着狗出去遛了遛。我回来的时候正巧碰见她出来，手里拿的东西是——我的电动牙刷。
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