absence of external auditory meatus

例句：

1. 1. The absence of external auditory meatus can lead to hearing loss.
   外部听觉孔的缺失可能导致听力损失。
2. 2. Thedoctor performed an operation to remove the absenceof external auditory meatus.
   医生进行了手术来移除外部听觉孔的缺失。
3. 3. Thepatient was diagnosed with a condition where theabsence of external auditory meatus causeddifficulty in hearing.
   患者被诊断出一种情况，其中外部听觉孔的缺失导致听力困难。