- straight drill
- 直: straight; stiff
- 钻头: boring crown; bore bit; dril ...
- 垂直钻进: vertical drilling
- 垂直钻探: vertical boring
- 钻头: boring crown; bore bit; drilling bit; [机械工程] bit (of a drill) 三牙轮钻头 three cone bit; 卸下钻头 break out a bit; 装上钻头 brace a bit
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