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lead tetraethyl

n.
1.a clear oily poisonous liquid added to gasoline to prevent knocking

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    Idiom of the Day

    a sacred cow
    something that is never criticized even if it sometimes deserves to be
    The national park system is a sacred cow of the government and is never criticized by anyone.



    1.
    The shortest distance between two places is as the ________ flies.

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