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copper pyrites

n.
1.a yellow copper ore (CuFeS2) made up of copper-iron sulfide

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    Idiom of the Day

    bottle (something) up or bottle up (something)
    to hold one's feelings inside of you
    My aunt bottles up her feelings and has much stress because of it.



    1.
    She was in such a state of extreme nervousness when she was ________ for the interview that she burst into tears.

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    If a substance is burned and all of the results of its burning (smoke, ash, soot and gas) are captured and weighed, they will be a little heavier than the original substance because they have been combined with oxygen.      .. More >>
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