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  1. Oxford Dictionary

    alpha particle

    英式

    • n.
      a helium nucleus emitted by some radioactive substances, originally regarded as a ray.

    • noun: alpha particle, plural noun: alpha particles

    • 更多解釋

    alpha particle

    • IPA[ˈpärdəkəl]

    美式

    • n.
      a helium nucleus emitted by some radioactive substances, originally regarded as a ray.

    Oxford American Dictionary