noun🔗Share沉头孔，埋头孔 A cylindrical recess, typically machined around a hole to admit a screw so that it sits flush with a surface."The carpenter used counterbores in the wooden tabletop so the screws wouldn't stick out. "木匠在木制桌面打了沉头孔，这样螺丝就不会突出来了。technicalmachineindustrypartbuildingChat with AIVocabulary GamePractice Reading
noun🔗Share沉孔刀，扩孔钻。 The tool with which a counterbore is machined."The machinist carefully selected the counterbores needed to create the precise recesses for the bolt heads in the metal plate. "为了在金属板上加工出精确的螺栓头沉孔，那位机械师仔细挑选了所需的沉孔刀/扩孔钻。machinetechnicalindustryChat with AIVocabulary GamePractice Reading
