basal segment of chelicera

例句：

1. 1.The basal segment of the tree is where the roots grow.
   树的基部段是根生长的地方。
2. 2. The basal segment of the plant is responsible for photosynthesis.
   植物的基部段负责光合作用。
3. 3.The basal segment of the structure is made up of a series of interconnected parts.
   结构的基部段由一系列相互连接的部分组成。