颜色是物质的重要物理性质，它与物质的结构、表面光滑度、颗粒大小及温度等因素有关。
The color is the important physical property of the material, the factors. Such as structure, smooth degree of surface, size of particle and temperature, etc. have something to do with it.
另一个问题：在一般情况下，更严格的公差，两维地，并且在表面光滑度，较昂贵的打印机。
Another problem: in general, the tighter the tolerances, both dimensionally, and in surface smoothness, the more expensive the printer.
银钎焊的阀门套管的内部直径的机械公差和表面光滑度要求非常精确，以确保有足够的附着力。
The interior dimensions of silver brazing valve sockets are machined to the closest tolerances and finished smooth to promote full capillary attraction .
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