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。
The long serrated knife is often called a bread knife because it is particularly good for slicing breads that require a back and forth sawing motion.
长齿刀经常被称为面包刀，因为人们在切面包时需要前后锯着切面包，长齿刀很适合这个工作。
The spins are then repeatedly flipped, causing the cantilever to gently sway back and forth in a synchronous motion.
这些磁旋反复的翻转，从而导致硅悬臂出现轻微的同步摆动。
Use your hand to power the hoop in a back-and-forth motion: the hoop will alternate between hitting the center of your palm and the back of your hand.
用你的手来给呼啦圈前后移动的力：呼啦圈会在你的手掌心和手背上交替着力。
When sound waves enter the cochlea, which is really a tube coiled around, they set a membrane into a back and forth motion and cause a new wave.
当声波进入耳蜗这条盘旋的管道，它令薄膜前后移动并且产生新的波动。
Once you've done all the sides, you can gently use that old back-and-forth motion to clean the top chewing surfaces of your teeth.
一旦刷完了内外两面，轻轻地使用旧式前后移动的方式来清洁牙齿的咀嚼面。
Move the little man back and forth with the mouse and plot his motion.
用滑鼠前后移动小人，画出其运动轨迹。
No external part is required by the device for reversing the cylinder, and the high-speed back-and-forth motion can be achieved, so that an object can move fast.
本装置不用任何外部件对气缸进行换向，就能达到高速往返运动，能使物体快速移动。
The wobble is primarily a back and forth motion for the globe, but takes the form of a Figure 8, well documented since 2003.
而地球的摆动主要是地球来回运动造成的，但是采取的是这种形式Figure8，自从2003年就被记录了。
I would like to ask you what to sit into the aircraft and what a person high in the high wheat fields back and forth in a circular motion…
请问你成坐的是什么飞机能够在一人多高的高度在麦田来回转圈…
Unless a child keeps pumping a swing, the back-and-forth motion decreases;
荡秋千的小孩除非不停地屈伸，否则秋千的运动就会因阻尼而停止；
Unless a child keeps pumping a swing, the back-and-forth motion decreases;
荡秋千的小孩除非不停地屈伸，否则秋千的运动就会因阻尼而停止；
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