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.
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.
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