首先必须要有的是汉语和英语。然后

  1. spanish
  2. hindi
  3. arabic
  4. bengali
  5. portuguese
  6. indonesian
  7. japanese
  8. turkish
  9. vietnamese
  10. korean
  11. iranian persian
  12. thai
  13. italian

可以考虑

  1. russian
  2. french
  3. german