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 .
过滤后的清洁空气，将通过直接管段进入空气压缩机的吸气口。
After the clean air filter, will directly into the air compressor pipe through the mouth to breathe in.
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