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electron gun

n.
1.the electrode that is the source of electrons in a cathode-ray tube or electron microscope

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    Idiom of the Day

    look out for (someone)
    to provide protection and care for someone
    "Please look out for my sister when she visits you this summer."



    1.
    Choose an idiom to replace the expression in the brackets:
    I do not like to play tennis with my friend because he is (someone who gets angry when he does not win).

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