primary bone marrow

例句：

1. 1. The patient's condition is critical, and we need to perform a bone marrow biopsy immediately.
   患者的病情危急，我们需要立即进行骨髓活检。
2. 2.The researcher discovered that the primary bone marrow cells were responsible for the patient's immune system.
   研究者发现，患者的主要骨髓细胞负责其免疫系统。
3. 3. The patient's bone marrow was abnormal, indicating a potential risk of leukemia.
   患者的骨髓异常，可能患有白血病的风险。