refractory anemia

例句：

1. 1.The patient's condition was so severe that he needed a bone marrow transplant.
   病人的情况非常严重，需要骨髓移植。
2. 2. This type of anemia is very rare and can be difficult to treat.
   这种贫血非常罕见，治疗起来很困难。
3. 3.The doctor diagnosed the patient with refractory anemia and prescribed medication.
   医生诊断出患者患有难治性贫血，并开了药。