proficiencyn.
英 prə'fɪʃ(ə)nsɪ | 美 prə'fɪʃənsi
中文n. 精通，熟练
词根词源
proficiency (n.)1540s, probably from -cy + Latin proficientem (nominative proficiens), present participle of proficere "accomplish, make progress; be useful, do good; have success, profit," from pro- "forward" (see pro-) + root of facere "to make, do" (see factitious).
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