骨髓：它是一种存在于骨骼中柔弱的海绵组织。
The Bone Marrow: This is soft spongy tissue which is found in the bony cavities.
骨髓是骨骼中一种柔软的、海绵状的组织。
骨髓是一种海绵状组织，是血细胞发育的源场所。
Marrow is the spongy tissue where blood cell development takes place.
骨髓是一种海绵状组织，是血细胞发育的源场所。
Marrow is the spongy tissue where blood cell development takes place.
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