短語詞組短語branch h hole 側(cè)眼directional branch -hole drilling 定向分支孔鉆進(jìn)branch hole drilling 分支井鉆井directional branch hole 分支鉆孔full -gauge branch hole 與主鉆孔直徑相同的分支鉆孔S -type directional branch hole 型定向分枝孔 返回 branch hole