Ball screw using ball movement, so the starting torque is very small, does not appear sliding movement crawling phenomenon, so can ensure accurate micro feed.

滚珠丝杠利用的是滚珠运动，因此启动力矩极小，不会出现滑动运动那样的爬行现象，故而能保证实现精确的微进给。

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In the Nature paper, the researchers discovered that the majority of crawling (movement along messenger RNA) occurs during a new kind motion, "head swivel," rather than ratcheting.

在《自然》的这篇论文中，研究者发现，多数移行(沿信使RNA运动)在一种新的运动中出现，“头部旋转”，而不是发生棘轮。

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It is composed of a circular autorotation crawling mechanism, a CCD camera, a movement control card based on DSP and a high-resolution image acquisition card, and so on.

该系统由环形自转式运动机构、CCD摄像机以及基于DSP的运动控制卡和高分辨率的图像采集卡等组成。

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