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electron optics

n.
1.the branch of electronics that deals with beams of electrons and their focusing and deflection by magnetic fields

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    Idiom of the Day

    put (someone or something) at (someone's) disposal
    to make someone or something available to someone
    I put myself at my friend's disposal when he visited me last summer.



    1.
    The following evening we were back again watching television but after the cinema it's never the ________ again.

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