carina of trachea

例句：

1. 1. The doctor performed a minor surgery on the patient's trachea to relieve his breathing difficulties.
   医生对患者的气管进行了一次小手术，以缓解他的呼吸困难。
2. 2. During the operation, the surgeon carefully removed the carina of the trachea to prevent any complications.
   在手术过程中，外科医生小心地移除了气管的软骨，以防止任何并发症。
3. 3. The patient was given medication to treat the inflammation in the trachea and reduce the risk of infection.
   患者被给予药物来治疗气管的炎症，并降低感染的风险。