tracheal sac

例句：

1. 1. The surgeon removed the tracheal sac to relieve the patient's breathing difficulties.
   外科医生切除了气管囊，以缓解患者的呼吸困难。
2. 2. During surgery, the surgeon carefully preserved the tracheal sac to prevent damage to the lungs.
   在手术过程中，外科医生小心翼翼地保护气管囊，以免损伤肺部。
3. 3. After the operation, the patient was transferred to a recovery room where the tracheal sacwas reconnected to the lungs.
   手术后，患者被转移到恢复室，在那里将气管囊重新连接到肺部。