Calcium is a soft white element which is found in bones and teeth, and also in limestone, chalk, and marble.
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Calcium is a soft white element which is found in bones and teeth, and also in limestone, chalk, and marble.
N-UNCOUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012