The drill bit breaks through the wall and he smiles.
当钻头钻通了墙后，他高兴地笑了。
Also in development are new drilling muds that cool the drill bit during operation.
新的钻探泥浆(用于在操作时冷却钻头)也在开发中。
To deepen a wellbore with the drill bit. To drill ahead.
用钻头加深井眼，往深处钻进。
Are resharpened drill bit inspected and identified prior to use?
再次研磨的钻咀是否在使用前进行检验与确认？
Are resharpened drill bit inspected and identified prior to use?
再次研磨的钻咀是否在使用前进行检验与确认？
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