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ion exchange

n.
1.a process in which ions are exchanged between a solution and an insoluble (usually resinous) solid

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  • Idiom of the Day

    have a pick-me-up
    to eat or drink something stimulating
    The carpenter bought a protein drink as a pick-me-up in the middle of the afternoon.



    1.
    In Europe autumn begins ________ September.

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