构成基部的

例句：

1. 1. The tree's trunk is the base of its structure.
   这棵树的树干是其结构的基础。
2. 2.The foundation of the house is made of concrete.
   这所房子的基础是用混凝土做的。
3. 3. The roots of the plant are crucial for its survival.
   植物的根对它的存活至关重要。