vascular cylinder

常见例句

双语例句

• The central cylinder in which the primary vascular tissue is arranged around a pith, as in most seed plants.
  一种管状中柱，其中初生脉管组织排列在髓孔周围，存在于大多数种子植物中。
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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.
  主根粗壮，其中柱周围产生2或3轮呈同心环状排列的异常维管束。 这种异常结构对旱生植物具有重要的生态学意义。
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