| 单词 | 形成层 |
| 释义 | 〔tier〕To arrange (something) into or rise in tiers:层层排列：把（某物）分成层或形成层：〔cambium〕A lateral meristem in most vascular plants that forms parallel rows of cells resulting in secondary tissues either as secondary growth or as cork.形成层：大多数导管植物中靠近边缘的分生组织，它形成植物细胞组成的平行的行列，导致产生二次组织、二次增生或长成软木〔procambium〕A type of undifferentiated plant tissue that gives rise to vascular tissue.原始形成层：植物分层组织的种类，产生维管束组织〔layer〕To divide or form into layers:使分开并形成层次：〔bark〕The tough outer covering of the woody stems and roots of trees, shrubs, and other woody plants. It includes all tissues outside the vascular cambium.树皮，茎皮：包在树、灌木和其它木本植物的根部、茎部的硬皮，包括维管形成层外的所有组织〔periderm〕The outer layers of tissue of woody roots and stems, consisting of the cork cambium and the tissues produced by it, such as cork.周皮：木质根或干的外层组织，包括软木形成层和形成层的产物，如软木〔sapwood〕Newly formed outer wood that lies just inside the cambium of a tree trunk and is usually lighter in color and more active in water conduction than the heartwood.边材：树木的树干形成层内的新生木质，通常色泽较浅，传导水分比树心部更为活跃 |
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