开合这三把刀可以用拇指柱来完成。
Opening and closing of these three knives is accomplished by a thumb stud.
在冷弯薄壁型钢结构中，为了降低层高而让管线从梁中通过，在梁和柱的腹板及翼缘中常需要开孔洞。
In cold-formed steel structures, we need to open holes on flange and web of beams and columns for the purpose of getting through the pipeline.
之后司钻上提整个钻柱，移去卡瓦，在开泵并旋转的同时小心地下放钻柱，当钻头接触到井底之后，重新开始钻进。
The driller then picks up the entire drillstring to remove the slips, carefully lowers the drillstring while starting the pumps and rotary, and resumes drilling when the bit touches bottom.
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