By the end of its journey, the phloem sap has thinned into a watery substance, pooling at the base of the tree.
这个旅程的最后,韧皮树液变成很稀,类似水一样的物质,聚集在树的底部。
双语版 TED-Ed 演讲精选
Containing the sugars generated in leaves during photosynthesis, phloem sap is thick, like honey, and flows down the plant's phloem tissue to distribute sugar throughout the tree.
Here at the tree's base, there are more of these particles in one tissue than the other, so the water from the phloem sap is absorbed into the xylem to correct the balance.
在树的根部,这些组织里的微粒分布不均匀,因此,韧皮树液中的水分被吸收到木质中,来调节平衡。
英语百科
Sap
Sap is a fluid transported in xylem cells (vessel elements) or phloem sieve tube elements of a plant. These cells transport water and nutrients throughout the plant.
Sap is not to be confused with latex, resin or cell sap; it is a separate substance, separately produced, and with different components and functions.