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TOEFL IELTS BNC: 4908 COCA: 5615
calcium
noun [U] chemistry /ˈkælsiəm/
  1. a white chemical element that is an important part of bones and teeth and is found in some types of rock (化学元素)钙
     Synonyms and related words
    Chemical elements: actinium, alkali metal, americium...
TOEFL IELTS BNC: 4908 COCA: 5615
TOEFL IELTS BNC: 4908 COCA: 5615

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