To get there they had to chisel away a concrete cell wall, and, of course, it had to be done slowly and on the QT.
为了到达这个通风口，他们必须凿穿一堵混凝土墙，当然，必须缓慢而秘密地进行这个工作。
Cut cured concrete pipe sections with saw or chisel, and cement sections together to form odd shaped fittings.
用锯子或凿子一起切割固化混凝土管段以及水泥部分，形成奇形接头。
Cut cured concrete pipe sections with saw or chisel, and cement sections together to form odd shaped fittings.
用锯子或凿子一起切割固化混凝土管段以及水泥部分，形成奇形接头。
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