圆孔口 meaning in Chinese

circular orifice

Standard test method for measuring the rate of well discharge by circular orifice weir
圆孔口量水堰法测量井水排放速率的标准试验方法
Based on the above work , the author analyzed the stress in an infinite plate with oval hole which is commonly used in structures and figured curves of stress concentration to hole ' s shape parameters
应用由该方法编制的程序对工程上常用的腰圆孔口问题进行了应力分析，给出应力集中系数与孔口参数相关曲线。