至此，我已经介绍了更改立方体外观的两种方式：顶点颜色和材质。

So far, I've shown you two ways of changing your cube's appearance: vertex colors and materials.

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简单的照明和大理石材质产生了整洁、光滑的外观。

The simple lighting and marble features make for a clean and sleek look.

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也就是你可以研磨材质或表面涂层的一小部分并且让它们恢复成原本看起来的表面外观吗。

As in, can you abrade small particles of the material or surface coating and leave behind an original looking surface.

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