Bone marrow (or myeloid tissue) : Soft, gelatinous tissue that fills bone cavities.

骨髓：填充于骨腔中的柔软凝胶状组织。

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In humans the cornea is clear, but it is more a thin, gelatinous layer of proteins and sugars than true cellular tissue.

人类的角膜是透明的，但它只是薄薄一层由蛋白质与糖类构成的胶状结构，而非细胞构成的组织。

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