维管束

例句：

1. 1. The tree's vascular system is essential for its survival.
   这棵树的维管系统对其生存至关重要。
2. 2. The roots of the plant are connected to the vascular system.
   植物的根与维管系统相连。
3. 3. The vascular system helps transport water and nutrients throughout the plant.
   维管系统帮助植物在整个生长过程中输送水分和养分。