secondary marrow cavity

例句：

1. 1.The patient's condition is stable, but the secondary marrow cavity is still enlarged.
   患者的病情稳定，但次级骨髓腔仍然扩大。
2. 2. During surgery, the surgeon carefully removed the secondary marrow cavity to prevent infection.
   手术中，外科医生小心地切除了次级骨髓腔以防止感染。
3. 3.The patient's recovery process was slow, and the secondary marrow cavity continued to expand.
   患者的康复过程缓慢，次级骨髓腔继续扩大。