cartilaginous external acoustic meatus

例句：

1. 1. The patient had a cartilaginous graft placed in his knee joint.
   患者接受了一个软骨移植到他的膝关节。
2. 2. The bones in the human body are mostly cartilaginous.
   人体中的骨骼大多是软骨的。
3. 3. The bone marrow is composed of cartilage and blood vessels.
   骨髓由软骨和血管组成。