vascular cylinder

常見例句

雙語例句

• The central cylinder in which the primary vascular tissue is arranged around a pith, as in most seed plants.
  一種管狀中柱，其中初生脈管組織排列在髓孔周圍，存在于大多數(shù)種子植物中。
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• The thickened tap root appeared to consist of 2 or 3 rings of anomalous vascular bundles surrounding the central cylinder which might be an important adaption to dry condition.
  主根粗壯，其中柱周圍產(chǎn)生2或3輪呈同心環(huán)狀排列的異常維管束。 這種異常結構對旱生植物具有重要的生態(tài)學意義。
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