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pair formation

n.
1.the transformation of a gamma-ray photon into an electron and a positron when the photon passes close to an atomic nucleus

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    Idiom of the Day

    make (someone's) blood run cold
    to shock or horrify someone
    The sight of the injured family in the car accident made my blood run cold.



    1.
    Teacher: So what do you know ________ prepositions?

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    My Account / Test History
    Invention
    Invention : pacemaker, cardiac
    Year : 1952
    Inventor : paul m. zoll
    Country : us.      .. More >>
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