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1·I plan to take Russian course this semester to get on with the study of second foreign language.

我计划这学期选修俄语课程，继续学习第二外语。

2·I want to learn a second foreign language besides English.

除了英语，我还想学第二门外语。

3·My second foreign language is French.

我的二外是法语。

4·My second foreign language is Japanese.

我的第二外语是日语。

5·I want to study a second foreign language.

我想学习第二外语。

6·What second foreign language you wanna learn?

你想学习哪门第二外语？

7·We study Japanese as a second foreign language.

我们把日语作为第二外国语为学习。

8·English, he also learned a second foreign language.

除了英语，他还学了第二外语。

9·English, he has to study a second foreign language.

除英语外，他还要学第二外语。

10·We are learning Japanese as a second foreign language.

我们把日语作为第二外国语学习。