• 1. drag bit: 刮刀钻头 | 翼状钻头
• 2. stepped drag bit: 阶梯刮刀钻头
• 3. step type drag bit: 阶梯形刮刀钻头

更多释义

• 1.The tests for the effects of jet position on drag bit cutting process were described.
  就射流相对于刀具的四处不同位置对切割效能的影响进行了测试。
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• 2.The bit is usually a drag bit fitted with either PDC or natural diamond cutting structures, but the core bit is unusual in that it has a hole in its center.
  钻头通常属于刮刀型，装备有PDC或者天然金刚石切削齿，但取芯钻头的特别之处在于钻头中心有一孔。
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• 3.And just as their long, heavy trains pose a burden to peacocks, the extravagant feathers of Anchiornis may have been a bit of a drag, literally.
  对于雄孔雀来说，硕长且沉重的尾屏是个沉重的负担，而过多的羽毛可能也同样拖累了近鸟龙。
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