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proficiency noun

  /pɹəˈfɪʃənsi/
  • Ability, skill, competence.
 上達, 熟練, 熟練度, 習熟, 習熟度

proficient adjective

  /pɹoʊˈfɪʃ.ənt/ , /pɹəˈfɪʃ.ənt/
  • Good at something; skilled; fluent; practiced, especially in relation to a task or skill.
 上手, 熟練
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