noun 下载 🔗分享 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. Examples : "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。 technical machine industry part building 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 沉孔刀,扩孔钻。 The tool with which a counterbore is machined. Examples : "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。 machine technical industry 与AI对话词汇游戏阅读练习