松质骨扩展区，之所以这样称为，是因为不规则的骨髓腔隙深入到骨基质中。
Enlarged area of spongy bone, so called because there are large, irregular Spaces of bone marrow intermixed with the bony substance.
松质骨扩展区，之所以这样称为，是因为不规则的骨髓腔隙深入到骨基质中。
Enlarged area of spongy bone, so called because there are large, irregular Spaces of bone marrow intermixed with the bony substance.
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