介绍了一种大导程波形联结螺纹的高效加工方法，借助计算机进行了螺纹牙形的精度分析，得出了齿形误差曲线。
This paper presents a high efficient process method of a steep lead tread of coupling screw and studies the profile accuracy by using electronic computer and arrives at the profile error curve.
可能是因为周末是万圣节的关系，上面的图片让我联想到了下面的画面。想象一下，头发不是蛇而是牙形刺的美杜莎。
It might be due to the Halloween weekend, but the above reminds me of the below image. Imagine if Medusa had conodonts instead of snakes.
牙形刺生活在寒武纪的海洋中，可能以某种浮游生物为食，不过没人清楚具体情况。
Conodonts lived in the Cambrian seas, and may have eaten certain types of plankton, but no one knows for sure.
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