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action spectrum

n.
1.the efficiency with which electromagnetic radiation produces a photochemical reaction plotted as a function of the wavelength of the radiation

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    Idiom of the Day

    yellow streak
    cowardice in a person`s character
    The boy has a yellow streak and will not help defend his friends.



    1.
    Her mother ________ last week.

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    Leather used to be cured with a mixture of dog and chicken faeces smeared on it for many months. The fat and rotting meat scraps were scraped off with a knife.      .. More >>
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