competent or skilled in doing or using something 精通的;熟练的 I was proficient at my job. 我对工作很精通。 she felt reasonably proficient in Italian. 她觉得自己的意大利语挺熟练。
派生 proficiency noun proficiently adverb 语源
late 16th cent.: from Latin proficient- 'advancing', from the verb proficere, from pro- 'on behalf of' + facere 'do, make'