A great number of Egyptians are proficient in foreign languages.

大量埃及人精通外语。

《柯林斯英汉双解大词典》

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It turns out in the world of classical music there's a stereotype of women being simply less proficient than men: they play smaller than men, they don't have the same force and they have smaller techniques, they're more temperamental and so on.

在古典音乐界,有一个刻板印象,女人的造诣就是不如男人：,她们演奏得不如男人宏大，她们力量不如男人，她们技巧不如男人，她们喜怒无常等等。

耶鲁公开课 - 心理学导论课程节选

Until you're a proficient reader of a language, writing in our language is a fool's errand.

你只有成为一个熟练的读者，才有可能成为一个好的作者。

英语阅读：技巧 - SpeakingMax英语口语达人

Because a poor black kid who gets good grades, has a part time job and becomes proficient with a technical skill will go to college.

FORBES: If I Were A Poor Black Kid

Singer-songwriter Patty Larkin is a proficient multi-instrumentalist who shows off her abilities in a session on World Cafe.

NPR: Patty Larkin: Haunted Songs

As of 2010, according to the 2010 National Assessment of Educational Progress, only 13 percent of high school seniors and 18 percent of eighth graders had a proficient knowledge of American history.

FORBES: 83% of American Adults Don't Grasp American Revolution