n.韧皮部；筛部
In vascular plants, the xylem and phloem serve to translocate such substances. 维管植物的木质部和韧皮部主要进行对这类物质进行运输。
The secondary phloem consisted of sieve cells and phloem parenchymas. 根的次生韧皮部则由筛胞和韧皮薄壁细胞组成。
