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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

    give (someone) one's word
    to make a promise to someone
    My friend gave me his word that he will meet me at the library.



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