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parabolic mirror

n.
1.a parabolic reflector for light radiation

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    Idiom of the Day

    wear out
    to use or wear something until it becomes useless
    My shoes wore out during my trip to Paris.



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    The wind ________ down the fence

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    Aztecs believed that the sun died every night and needed human blood to give it strength to rise the next day. So they sacrificed 15,000 men a year to appease their sun god, Huitzilopochtli. Most of the victims were prisoners taken in wars, which were sometimes started solely to round up sacrificial victims.      .. More >>
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