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.
空想科学和神秘主义思想巨匠富勒认为：宇宙建筑的形，必然是圆，空间必然是球体。
Utopian thinking of science and mysticism that Fullerton great masters: the construction of the universe-must be round, space must be spherical.
空想科学和神秘主义思想巨匠富勒认为：宇宙建筑的形，必然是圆，空间必然是球体。
Utopian thinking of science and mysticism that Fullerton great masters: the construction of the universe-must be round, space must be spherical.
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