... back and forth method 选择法; 选择试法 back and forth motion 往复运动 back and forth pass 来回通过 ...
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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。
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。
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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