yellow marrow

例句：

1. 1. The doctor said that the patient needed to have yellow marrow removed.
   医生说病人需要取出黄色骨髓。
2. 2. Yellow marrow is a rare and valuable substance found in certain animals.
   黄色骨髓是一种稀有且珍贵的物质，存在于某些动物体内。
3. 3. The process of removing yellow marrow can be painful and time-consuming.
   移除黄色骨髓的过程可能很痛苦且耗时。