Definitions

[1] n. 精通, 熟练, 精练

[ prə'fɪʃənsɪ ]

1. I've heard it said that there is no way for you to ever reach native proficiency in a language if you haven't started studying it before the age of twelve.
   我聽說，如果沒在十二歲前開始學一個語言，是無法達到母語等級的。
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