短語詞組短語shaft t boring 鉆井Shaft boring machines 礦用鉆井機(jī)shaft sinking by boring 鉆井法鑿井shaft boring detail 豎井鉆進(jìn)shaft boring machine 豎井掘進(jìn)機(jī)shaft boring through clay layer 粘土層鉆井full face shaft boring machine 豎井鉆機(jī) 返回 shaft boring