他的观点是，在某种程度上二者均由运输物质的网络构成——公路，铁路，水路以及煤气管，污水管还有电缆线都在输送物质，动物血管和植物运输汁液的木质部、韧皮部也是如此。
Roads, railways, water and gas mains, sewage pipes and electricity cables all move things around. So do the blood vessels of animals and the sap-carrying xylem and phloem of plants.
管道运输在输送气体、流体、浆体等方面具有独特的优势，已成为继铁路、公路、水路、航空运输之后的第五大运输工具。
With the unique advantage of transmitting gas, liquid and slurry, pipeline has become the fifth important conveyance after railway, highway, waterway and voyage.
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