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black lead

n.
1.used as a lubricant and as a moderator in nuclear reactors

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    Idiom of the Day

    in a word
    briefly, to sum up
    In a word, the problem with the car is that it needs a new motor.



    1.
    The trouble ________ my mother in law is that she doesn't listen to anybody.

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    My Account / Test History
    Invention
    Invention : traffic lights, automatic
    Year : 1923
    Inventor : garrett a. morgan
    Country : us.      .. More >>
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