per phloem strand

例句：

1. 1. The plant's growth is closelylinked to the distribution of its perphloem strands.
   植物的生长与其韧皮纤维带的分布密切相关。
2. 2. Thescientist studied the per phloemstrands in the tree to understandits growth patterns.
   科学家研究了树木中的韧皮纤维带，以了解其生长模式。
3. 3. The per phloemstrands are responsible for transporting nutrientsfrom the roots to the leaves.
   韧皮纤维带负责将养分从根部输送到叶子。