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hertz

n.
1.the unit of frequency
2.German physicist who was the first to produce electromagnetic waves artificially (1857-1894)
3.German physicist who with James Franck proved the existence of the stationary energy states postulated by Bohr (1887-1975)

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    Idiom of the Day

    in one's spare time
    in one's free time
    My cousin likes to fix old clocks in his spare time.



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