[] the ability to do or use sth well because you have had training and practice 熟练；精通◆developing technical proficiency 提高技术熟练程度◆You need to demonstrate a high level of proficiency in English. 你要展现高超的英语水平。▸proficient /prəˈfɪʃnt/
adjective
◆He's proficient at his job. 他的工作效率很高。◆She's proficient in several languages. 她精通几种语言。