The word is proficiency, meaning skill or expertise in something.
这个单词是 proficiency，意思是熟练、精通或娴熟。
| 单词 | proficiency |
|---|---|
| 音标 | [prə'fɪʃnsɪ] [prəˈfɪʃənsi] |
| 释义 | n.["熟练，精通，娴熟"] |
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