这些条件有助于进化出用于支撑枝干的结构、运输水分和养分到植物各部分的导管以及储存水分的结构。
These conditions favored the evolution of the structures that support the body, vessels that transport water and nutrients to all parts of plant, and structures that conserve water.
每个部件的整个重量由它的表面支撑，比较厚重的部位让人联想起承受大部分重量的导管结构。
The entire weight of each object is supported by its skin, with thicker areas that are reminiscent of natural vascular structures bearing most of the load.
一个原因是树木的分室的导管系统（Compartmentalized vascular system)，因此可以允许树木一部分死亡，而同时另一部分仍然在旺盛的生长。
One secret to their longevity is their compartmentalized vascular system, which allows parts of the tree to die while other portions thrive.
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