back and forth motion的意思|示意

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。

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。

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。

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Figure 8，自从2003年就被记录了。

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。