primary external auditory meatus

例句：

1. 1. This surgery involves opening the primary external auditory meatus to repair the damage.
   这种手术涉及打开初级外耳道开口以修复损伤。
2. 2. The doctor advised him to keep his ears clean and dry to prevent infection in the primary external auditory meatus.
   医生建议他保持耳朵清洁干燥，以防止感染初级外耳道开口。
3. 3. During a routine check-up, the doctor found a small swelling in the primary external auditory meatus.
   在一次常规检查中，医生发现初级外耳道开口处有一小肿块。