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.
专门用来运输矿物元素的系统称为木质部。
A system confined to the transport of mineral elements is known as the xylem.
在老茎中，仅最新的木质部环参与物质的运输。这些木质部环组成边材。
In older stems, only the most recent rings of xylem participate in the transport of materials. these make up the sapwood.
以前发现的拟南芥中几个位点的隐性突变导致了木质部萎陷的表型，但没有观察到水分运输的缺失。
Recessive mutations in several loci of Arabidopsis were previously shown to lead to a collapsed xylem phenotype but water-transport deficiency was not observed.
同化物在韧皮部中以液流形式运输，液流中的水主要来自木质部。
The assimilate transports in the phloem by liquid form and the water of the liquid mainly comes from the xylem.
同化物在韧皮部中以液流形式运输，液流中的水主要来自木质部。
The assimilate transports in the phloem by liquid form and the water of the liquid mainly comes from the xylem.
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