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optical maser

n.
1.an acronym for light amplification by stimulated emission of radiation

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    Idiom of the Day

    pay in advance
    to pay for something before it is received or delivered
    I paid in advance for the frames for my pictures.



    1.
    Choose an idiom to replace the expression in the brackets:
    You should (think carefully) before talking to your boss about the problem or you will make it worse.

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