Uses the X pattern of abrasion produced by a rotary action of a pair of abrasive wheels.

通过一对磨擦轮的旋转作用产生“X”型磨擦作用。

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The picture, taken with upgraded Hubble's powerful new camera, shows a mysterious X-shaped pattern with trailing streamers of dust that suggest the collision was head-on, say experts.

专家说，这张用改进的哈勃功效强大的新相机拍摄的照片显示出一个神秘的X形图案，和由尘埃组成的尾部飘带，说明小行星是正面相撞。

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There is no way that you could irradiate a crystal of nickel with a single beam of x-rays and get that circular ring pattern if the electron beam were behaving as a particle beam only.

没有什么其他的途径,可以让镍晶体发射,单束X光来,继而得到环状图案,如果电子束,是以粒子束形式出现的。

麻省理工公开课 - 固态化学导论课程节选