calcium carbonate
noun [ U ] chemistry specialized uk/ˌkæl.si.əm ˈkɑː.bən.eɪt/ us/ˌkæl.si.əm ˈkɑːr.bən.eɪt/
碳酸钙
a common, white chemical compound found naturally as chalk, marble, and limestone, and in bones and shells, etc.
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