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sodium-vapor lamp

n.
1.lamp in which an electric current passed through a tube of sodium vapor makes a yellow light

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    Idiom of the Day

    take (someone) by surprise
    to startle someone, to surprise someone
    The sudden resignation of the mayor took everyone by surprise.



    1.
    Of all the friends (a) / I have had, he is the most helpful (b) / and less arrogant. (c) /No error (d)

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