骨髓是一种红色、海绵状的东东，居住在很多大骨头的腔隙（骨髓腔）里；它需要铁元素、维生素B 12 、叶酸等原料来制造血红蛋白和红细胞。
To produce hemoglobin and red blood cells, your body needs iron, vitamin B-12, folate and other nutrients from the foods you eat.
推测这种微小球体通过骨髓或脂肪组织的损伤而被释放，并通过骨髓血管窦状隙或小静脉的破裂获得进入循环的通路。
Presumably the microglobules are released by injury to marrow or adipose tissue and gain access to the circulation by rupture of the marrow vascular sinusoids or venules.
骨髓是骨骼中一种柔软的、海绵状的组织。
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