double-bore well
... 双筒绞盘机 double-drum winch; 双筒井 double-bore well; 双筒立体显微镜 orthostereoscope; ...
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双筒井钻机 dual drill rig
双筒钻井 simultaneous drilling ; double barreled drilling
密集双筒钻井 dual bore cluster drilling
双筒缠绕式凿井绞车 Double-drum shaft sinking winder
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