bolt-hole treater钻孔处理器
bolt-hole teater螺栓孔处理器
bolt-hole clearance栓孔间隙
Bolt-hole fits钉孔配合
bolt-hole brush清坯圆刷
threaded bolt-threaded hole螺纹螺栓
bolt-hole corner crack螺栓孔角裂纹
flange-bolt-hole法兰螺栓孔
four-bolt hole pattern四螺栓孔结构
N（名词） a place of escape from danger 避难所