/prəˈfɪʃənt/
able to do sth well because of training and practice 熟练的；娴熟的；精通的；训练有素的
I’m a reasonably proficient driver.
我开车的技术还算不错。
~ in sth/in doing sth
She’s proficient in several languages.
她精通好几种语言。
~ at sth/at doing sth
He’s proficient at his job.
他的工作效率很高。