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.
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.
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