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》

She's proficient in several languages.

她精通好几种语言。

《牛津词典》

The W3C XML schema recommendation (the full name for "schema") is at least as complex as most programming languages, and requires just as much effort to become proficient.

W3C XML模式推荐(“模式”的全称)至少与大多数编程语言一样复杂，要精通它需要花很多工夫。

youdao

Prof Touwaide is proficient in 12 languages and has spent years collecting his library of 15, 000 books on plants and their uses.

BBC: Plants found in ancient pills offer medicinal insight

And they pay for Google's Dublin office, where 900 people, proficient in 35 languages, proofread Google ads headed for Europe and the Mideast.

FORBES: The Google Industrial Complex