n.成骨；骨化；（思想的）僵化

Ossification is the process by which bones form from cartilage.
骨化是骨头从软骨发育成骨的过程。
The femur, or thigh bone, undergoes complete ossification during fetal development.
股骨（大腿骨）在胎儿发育期间完成骨化。
Intraosseous ossification occurs within the bones themselves.
内骨化发生在骨内部。
Ossification defects can lead torickets in children.
骨骼发育缺陷可能导致儿童得佝偻病。
The ossification centers in the growing bones mature gradually.
生长中的骨骼的骨化中心逐渐成熟。
Ossification of the sternum (breastbone) takes place after birth.
胸骨（胸骨）在出生后才开始骨化。
Ossification is a vital part of the vertebral column's growth.
骨化是脊柱生长的重要环节。
Calcaneus, the heel bone, is one of the last bones to fully ossify.
跟骨（脚后跟）是最后完全骨化的骨头之一。
Africans have a higher rate of bone ossification compared to Europeans.
非洲人的骨骼骨化速度比欧洲人快。
Osteoporosis is a condition characterized by decreased bone ossification.
骨质疏松症是指骨密度减少，骨化减慢的状况。