chronic deafness

例句：

1. 1. He has been sufferingfrom chronic deafness for many years.
   他多年来一直患有慢性耳聋。
2. 2. The patient's condition was diagnosed as chronic deafness.
   患者的病情被诊断为慢性耳聋。
3. 3. The researcher found that the causeof chronic deafness is often dueto genetic factors.
   研究者发现，慢性耳聋的原因往往与遗传因素有关。