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pair creation

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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Word of the Day

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    Idiom of the Day

    clear sailing
    to be an easy situation
    It was clear sailing after we finished work and began our holiday.



    1.
    Choose an idiom to replace the expression in the brackets:
    Building the highway in the mountains was (very difficult).

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