管下扩眼偏心钻头
eccentric underreaming bit
胆总管下段癌
cancer in diatal of common bile duct
胆总管下段嵌顿结石
Segment inferior of common bile duct incarceration
Segment inferior of common bile duct incarceration stones
复杂性输尿管下段结石
complex lower ureter stone
管井井点降水
Dewatering and drainage design by pipe well points
dewatering and drainage design by pipe well-points