Second thing we want to talk about very briefly as we go along is the semantics of the language.

我们要说的第二点,是语言的语义。

麻省理工公开课 - 计算机科学及编程导论课程节选

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

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