下面的讨论中假定轮齿加工没有误差，轮齿表面完全光滑，轮齿为绝对刚体。
The following discussion assumes the teeth to be perfectly formed, perfectly smooth, and absolutely rigid.
如果这个表面是光滑的(比如大理石)，那将完全改变这幅照片。
If this surface was smooth (such as marble), it would completely change the image.
这个光滑的表面当然就是柏拉图认为的完全的遗忘——同一过程的相反方面。
This smooth surface was, of course, what Plato considered to be complete forgetting-the opposite aspects of the same process.
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