atresia

例句：

1. 1.He was diagnosed with atresia and required surgery.
   他被诊断出患有失血症，需要进行手术。
2. 2. The patient's condition worsened due to atresia.
   由于失血，患者的病情恶化了。
3. 3.A sudden loss of blood can lead to atresia.
   突然失去血液可能会导致失血。