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the father of radio

n.
1.United States electrical engineer who in 1907 patented the first triode vacuum tube, which made it possible to detect and amplify radio waves (1873-1961)

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    Idiom of the Day

    on the off-chance
    in case something may happen, with the slight possibility that something may happen
    I asked the salesman if he had the new computer in his store on the off-chance that he may have one.



    1.
    Choose an idiom to replace the expression in the brackets:
    I will (check) whether or not you can borrow the book.

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