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top quark

n.
1.a hypothetical quark with a charge of +2/3 and a mass more than 100,000 times that of an electron

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  • top side
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  • top-grade
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    Idiom of the Day

    find one's own level
    to find the position to which one is best suited
    The teacher helped the child find his own level in the reading class.



    1.
    Which is the correct plural?

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