calcification of posterior longitudinal ligament

例句：

1. 1.The patient's calcification of the heart valves is causing him discomfort.
   患者的心脏瓣膜钙化使他感到不适。
2. 2.The process of calcification is a natural part of bone development.
   钙化过程是骨骼发育的自然部分。
3. 3. The doctor advised the patient to undergo regular check-ups to prevent further calcification.
   医生建议患者定期检查以防止进一步的钙化。