second language和foreign language 的区别?我能不能理解为second language就像英语在很多欧洲国家被广泛应用,而英语在中国是foreign language,只是在教室里学学,出来这个环境大家都很少

还是有区别的,second language是第二语言,foreign language是外语（非母语）.一个人的foreign language可以有好几种,second language只有一个
every language used by a foreign nation which is different from your native language can be called a foreign language.
however,the notion of a "second language" can be explained like this:
this is a language u also have a good command of.in offical or common accasions,u may use your first language as first prioriry usually,but when first language can't be used to communicate with each other,the second language is up to.