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1·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》

2·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》

3·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。

4·I seemed to know it would do me good in future, but at that time I couldn't realize the fears of learning a second language.

我似乎知道这对自己将来有好处，但那时我没能意识到学习第二语言的好处。

5·It is worth mastering a second language in modern society.

在现代社会，掌握第二语言是值得的。

6·Learning English as a second language can be a painful experience.

将英语作为第二语言来学习可能是一段痛苦的经历。

7·In part this is because working in a second language slows down the thinking.

在某种程度上，这是因为用第二语言工作会放慢思考速度。

8·Do these same advantages benefit a child who begins learning a second language in kindergarten instead of as a baby?

这些优势是否同样有利于在幼儿园而不是婴儿期就开始学习第二语言的孩子？

9·In different countries around the globe, English is acquired as the mother tongue; in others it is used as a second language.

在世界各地的不同国家，英语作为母语被习得；在其他地方，它被用作第二语言。

10·While learning a second language, students should also enhance their awareness of the importance of mastering their mother tongue.

在学习第二语言的同时，学生也应该更加重视掌握母语的重要性。