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。”

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Proficient in English and Chinese.

精通英语和中文。

youdao

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。

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It takes students with the lowest skill levels five years to seven years to become proficient in English, research by Cook and Linquanti has shown.

NPR: Instruction Of Students Learning English Bleak

The House bill calls upon schools to certify their students are proficient in English after they have logged at least three years in U.S. classrooms.

CNN: Bush impatient with Congress on education bill

Yet most black South Africans are not proficient in English.

ECONOMIST: English is dangerously dominant