粗加工中，使用者可以设置最小留量，小于这个留量厚度的区域就不去加工了。

When roughing, the user can specify a minimum thickness to machine. Areas smaller that this thickness will not be cut.

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残余量粗加工使用一个留量模型至少0.25 MM的留量。

Rest roughing USES a stock model (which has a minimum resolution of 0.25mm). This model is only used for rest roughing.

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