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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

2. • 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