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graphite

noun
/ˈɡræfaɪt/
/ˈɡræfaɪt/
[uncountable]
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  1. a soft black mineral that is a form of carbon. Graphite is used to make pencils, to lubricate machines and in nuclear reactors.石墨Topics Physics and chemistryc1
    Oxford Collocations DictionaryGraphite is used before these nouns:
    • pencil
    • racket
    See full entry
    Word Originlate 18th cent.: coined in German (Graphit), from Greek graphein ‘write’ (because of its use as pencil “lead”).

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