stem system above the hypocotyl

例句：

1. 1. The stemsystem of the plant is essential for itsgrowth and development.
   植物的茎系统对其生长和发育至关重要。
2. 2. The stem system ofthe tree is made up of different partsthat work together to support the tree.
   树的茎系统由不同部分组成，它们共同支撑着树。
3. 3. The stem system ofthe plant is responsible for transporting waterand nutrients from the roots to the leaves.
   植物的茎系统负责将水分和养分从根部输送到叶子。