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.

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目前，动物传染性海绵状脑病的研究主要依赖于实验动物和培养神经细胞两种模型。

Now researches on the mechanism rely on the model of experimental animals and cultured neuronal cells.

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海绵状血管畸形由窦状扩张的血窦组成，窦壁由内皮细胞，基膜物质和周细胞组成。

There were endothelial cells , basal membrane like materials and pericytes in the walls of these blood sinus.

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