常見例句In roots, however, the concept is still applied, and in some angiosperm roots a fourth histogen zone is recognized, the calpytrogen, which gives rise to the root cap. 然而在根中，它還是適用的。在一些被子植物的根中，還發(fā)現(xiàn)了第四種組織原，即calpytrogen，與根冠發(fā)生有關(guān)。histogen concept 組織原概念histogenn. [植]組織原histogen theory 組織原學(xué)說See histogen theory; 參見histogentheory; 返回 histogeneous