n.韌皮部；篩部
In vascular plants, the xylem and phloem serve to translocate such substances. 維管植物的木質(zhì)部和韌皮部主要進行對這類物質(zhì)進行運輸。
The secondary phloem consisted of sieve cells and phloem parenchymas. 根的次生韌皮部則由篩胞和韌皮薄壁細胞組成。
