单词	breastbone
释义	breastbone /ˈbrɛs(t)bəʊn / noun A thin, flat bone running down the centre of the chest, to which the ribs are attached. Also called sternum.To get to your heart the surgeon makes an incision down the middle of your chest and separates your breastbone.... The heart is a hollow, muscular organ that lies in the center of the chest under the breastbone. All the blood cells are formed in the marrow of the flat bones such as the skull, breastbone and pelvis.
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