考虑该零件表面结构的不规则性但有较高精度的孔需要加工，定位基准选择“一面双孔”是最佳的方法。

Consider to the irregularity components but have high accuracy holes to be processing. So, "two holes at a face" is the best localization plan.

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分析表明，道路表面具有不规则性和统计自相似性，即每一部分都可视为整体缩小尺度之后的相似形。

The results showed that the road surface presents irregular performance and statistical self similarity, which means that each portion can be considered as a reduced scale image of the whole.

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结论在穿透性角膜移植术中应用非接触性、无热效应的准分子激光制作植床，可提高环钻质量，减少移植片表面的不规则性，使手术效果得到改善。

Conclusion Noncontact and nonthermal excimer laser penetrating keratoplasty can promote the quality of trephination, reduce the irregularity of grafts, and improve the effects of the operation.

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