| 单词 | bone marrow | 
| 释义 | bone marrownoun  : a soft highly vascular modified connective tissue that occupies the cavities of most bones and occurs in two forms:    a    : one that is yellowish, consists chiefly of fat cells, and is found especially in the cavities of long bones    b    : one that is reddish, is the chief site of blood cell formation, and occurs in the normal adult in cancellous tissue especially of certain flat bones  called also red marrow | 
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