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radio wave

n.
1.an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m

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Word of the Day

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  • radio transmitter
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  • radio-controlled aircraft
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  • radio-frequency spectrum
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    Idiom of the Day

    before long
    soon
    I had to wait a few minutes but before long my friend arrived.



    1.
    Choose an idiom to replace the expression in the brackets:
    The man's idea is a little crazy and definitely (very unusual).

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