n. tubulation
根据河流宽度，穿越管道可能很长，需要多根管段。
This string of pipe may be very long, depending on the width of the crossing.
在不可能安装较长的直管段情况下，可以来用导流叶片。
Straightening vanes can be used where long straight ways are not possible .
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.
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