The bottom hole pattern of a well is the aggregation of the pits on the bottom rock cut by the bit teeth in the course of drilling.
井底模式就是钻头在钻凿岩石的过程中，钻头牙齿在井底岩石上打出凹坑的集合。
Using full vector orthogonal function model of the auxiliary air hole pattern of cut-off characteristics of optical fiber were discussed.
利用全矢量正交函数模型对空气孔辅助光纤的模式截止特性进行了讨论。
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