spoon bit
... 蛇纹大理石：ophicalcite 勺形钻头：spoon bit 勺斗门：dipper door ...
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建立了牙轮钻头的球形齿、楔形齿和勺形齿三维空间的几何模型；
Geometry model of roller bit's sphere tooth, wedgy tooth and bucket shape tooth were established;
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