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TOEFL BNC: 18607 COCA: 12137
proficient
adjective /prəˈfɪʃ(ə)nt/
  1. very skilful at something that you have learned 熟练的;精通的
    proficient in :

    proficient in English/mathematics 精通英语的/数学的

     Synonyms and related words
    Skilful and able: able, capable, professional...

derived word

proficiently

adverb
 Synonyms and related words
Skilful and able: able, capable, professional...

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