endosarc

例句：

1. 1.The endosarc is a crucial part of the human skeletal system.
   内软骨是人体骨骼系统的重要组成部分。
2. 2. The endosarc is responsible for supporting the weight-bearing bones in the body.
   内软骨负责支撑身体中承重的骨骼。
3. 3.The endosarc is also responsible for providing flexibility and support to the joints.
   内软骨还负责为关节提供灵活性和支撑。