随着年龄增长，他思想的僵化使他难以接受新观念。

The ___ossification of his thinking made it hard for him to accept new ideas as he grew older.

医生通过X光片观察了骨折部位的骨化过程。

The doctor observed the ___ossification process at the fracture site through X-rays.

X光检查显示他的软骨出现了异常的骨化现象。

The X-ray showed abnormal ___ossification in his cartilage.