like: Fortgeschrittene → →
der Fortgeschrittene ☊ 
người đã có trình độ ☊ 
☊ Fortgeschrittene ☊ 进步者 ☊ jìnbùzhě an advanced student of English ☊ advanced ☊
a course for more advanced students ☊ more ☊
The star refers to items which are intended for the advanced learner. ☊ refer to sb/sth ☊
teach sth to sb: He teaches English to advanced students. ☊ teach ☊