木栓形成层 meaning in Chinese

cork cambium
phellogen

If the same phellogen functions from year to year , as in beech and oak , then the bark is smooth and consists only of tissue external to the phloem , mainly cork
如在榉木或橡木中，相同的木栓形成层年复一年的活动，那么树皮是光滑的，并且仅形成韧皮部的外方组织，主要是木栓（软木）。
If new cork cambia arise every few years , as in most species of woody plants , then the bark includes dead phloem and cortex as well as cork , and is termed rhytidome
若新的木栓形成层年年都有所加厚，像在多数的木本植物中，树皮就包括死去的韧皮部，皮层以及木栓（软木），这些部分共同构成落皮层。