骨骼是活组织，组织不断分解，然后用新的组织更换老的组织，就是新陈代谢。

Bones are living tissue. Tissues continually break down and then they replace themselves.

youdao

骨骼是活组织，组织不断分解，然后用新的组织更换老的组织，就是新陈代谢。

Bones are living tissue. Tissues continually break down and then they replace themselves.

youdao