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f region

n.
1.the highest region of the ionosphere (from 90 to 600 miles up) that contains the highest concentration of free electrons and is most useful for long-range radio transmission

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    Idiom of the Day

    seamy side of life
    the most unpleasant or roughest aspect of life
    The policeman learned much about the seamy side of life during his many years of work.



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