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rat hole
dril. 大鼠洞; 井底口袋; 方钻杆鼠洞; 大鼠洞; 井底小直径井眼
oil 井底部小直径井眼; 井底小口径井眼 (特殊完井); 鼠洞; 缩小井径再钻进
tech. 放备用钻杆的浅孔; 料仓内物料形成的管状漏斗; 大钻孔导孔; 储放钻杆的浅孔
rat hole: 16 phrases in 3 subjects
Drilling5
Oil / petroleum5
Technology6

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