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  1. Oxford American Dictionary

    cosmic ray

    • IPA[ˈkäzmik rā]
    • n.
      a highly energetic atomic nucleus or other particle traveling through space at a speed approaching that of light.

    • noun: cosmic ray, plural noun: cosmic rays

    • 更多解釋

    cosmic ray

    • n.
      a highly energetic atomic nucleus or other particle travelling through space at a speed ...

    Oxford Dictionary