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proficiency (adjective)
在特定领域的精通或熟练程度。
"I am working on my proficiency in basic home repairs so I can fix things myself."
Think of a 'PRO' who is 'FISH'ing for 'EN'ergy and 'CY' (see). A Pro-Fish-En-Cy. A pro needs proficiency to catch fish!
He is proficiency in English. → He is proficient in English. / He has proficiency in English.
I have proficiency of the guitar. → I have proficiency with the guitar. / I am proficient at the guitar.
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