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1·She's proficient in several languages.

她精通好几种语言。《牛津词典》

2·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》

3·The children of immigrants tend to be bilingual and proficient in English, by the third generation, the original language is lost in the majority of immigrant families.

移民的孩子往往会说两种语言，而且精通英语，“到了第三代，大多数移民家庭都丧失了原来的语言。”

4·She was very proficient in music.

她非常精通音乐。《新英汉大辞典》

5·Proficient in English and Chinese.

精通英语和中文。

6·Be proficient in application of OFFICE software.

能够熟练应用OFFICE办公软件。

7·Coke Light academic advanced, proficient in medicine.

焦光学术高深，精通医学。

8·I am proficient in English and I can speak a little German.

我英语很精通，而且我会说点德语。

9·Yet most black South Africans are not proficient in English.

然而，大多数南非人并不精通英语。

10·Today few people are proficient in the ordering and naming of life.

今天，只有很少的人精通分类和命名生命。