mar·row·bone /ˈmærəˌbon, oˌbon/
髓骨;精華;主要部分
Mar·row·bone n. A bone containing marrow; pl. ludicrously, knee bones or knees; as, to get down on one's marrowbones, i. e., to kneel.
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marrowbone
n : a bone containing edible marrow; used especially in
flavoring soup