A second foreign language refers to a second foreign language. You study German, so German is your first foreign language. As a second foreign language, you can choose one of the subjects offered by schools in Britain, Japan, France, Korea and Russia as a second foreign language. Generally speaking, English is the second foreign language for German majors, but if you know other foreign languages and can guarantee to do better than English, you can also apply for other languages as a second foreign language. You can also call Tongji Research Admissions Office to inquire about the situation before applying for the exam.