second foreign language第二外语;第二外国语
Second Foreign Language Practice二外实践课
second official language第二官方语言
second foreign language learning第二外语学习
second local language area布依族第二土语区
second foreign language russian二外俄语
second-language第二语言
Second generation language第二代语言
Second foreign language certificater第二外语证书
English is neither our mother tongue nor second language.
英语不是我们的母语,也不是第二语言。
参考来源 - 影响成功英语学习者的情感因素N-COUNT（可数名词） Someone's second language is a language which is not their native language but which they use at work or at school. 第二语言
Lucy teaches English as a second language.
露西教作为第二语言的英语。