Yahoo奇摩字典 網頁搜尋

搜尋結果

1. Oxford American Dictionary

   beta particle

   • IPA[ˈbādə ˌpärdəkəl]

   美式

   • n.
     a fast-moving electron emitted by radioactive decay of substances. (The emission of beta particles was originally regarded as a ray.).

   • noun: beta particle, plural noun: beta particles