... 同步圆 circle of spontaneity 球体圆 circle of the sphere 不定圈 circle of uncertainly ...
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本文论述了研磨原理及球体圆度误差趋小化研磨机理；对现有的各种研磨方式的研磨原理、研磨精度、研磨效率等进行了较为全面的比较。
This paper explains lapping principle and the small tendency mechanism of ball roundness error. It compares the principle, precision and efficiency of several high-precision lapping methods.
你真的有第一手信息来说明地球是圆的(或一个球体)吗？
Do you have firsthand knowledge that the Earth is round (a sphere)?
球体等一下我曾经看到一些照片上面都是小行星有个种不可思意的形状他们为什么不是圆的那？
Only because they aren't big enough for gravity to be a determining factor. If that asteroid were to suddenly become as big as a moon, it would indeed rearrange itself gradually into a sphere.
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