The bottom hole flow physical model of a kind of PDC coring bits is established considering the effect of junk slot and teeth layout in this paper.

以一种现场常用的PDC取心钻头为原型，充分考虑排屑槽和切削齿对于井底流动的影响，建立了与实际相接近的PDC取心钻头井底流场的物理模型。

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Once a golfer starts a round, the statistics by which all comparisons are made will be within fixed parameters except for the outcome, because each round of the tournament, each hole on the course, follows a predictable layout, so to speak.

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