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prince regent noun

  /ˌpɹɪns ˈɹid͡ʒ(ə)nt/ , /ˌpɹɪns ˈɹiːd͡ʒ(ə)nt/
  • A prince who rules a country as a regent in place of a monarch who is unfit to rule for a particular reason.
 摂政皇太子
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