Lucy teaches English as a second language.

露西教作为第二语言的英语。

《柯林斯英汉双解大词典》

Students are expected to master a second language.

学生们应该掌握一门第二语言。

《柯林斯英汉双解大词典》

It is the official language in more than 50 countries and 250-300 million people speak it as a second language.

它是50多个国家的官方语言，2.5亿到3亿人把它作为第二语言。

youdao

Through the implant process,called Intra-cranial Electrophysiology,or ICE, the researchers have found that Broca's area processes three different language functions in succession within a quarter of a second.

VOA: standard.2010.01.15

It turns out that if you start learning a language, a second language is where most of the work's been done, within the first few years of life you're fine.

如果你在出生的头几年里开始学习一门语言,非常努力地学习了第二门语言,那么你一切正常

耶鲁公开课 - 心理学导论课程节选

What do you think is the most important thing to teach students who learn English as a second language?

你觉得要教那些以英语为第二语言的学生，最重要的是什么？

教英语 - SpeakingMax英语口语达人

At the age of 12, pupils start a second language and at 14 a third language.

BBC: Straw regrets lack of languages

Schools are starting to teach English as much as Arabic as a second language.

ECONOMIST: Iraqi Kurdistan

And the majority of the kids at the school are ESL, English as a second language.

WHITEHOUSE: President Obama Speaks at White House Science Fair