A dual audio track means the video file contains two separate, switchable audio channels. Typically, for international releases of Hollywood classics, this includes:

It sounds like you’re looking for a review of a specific (or a release from a torrent/pirate site) rather than an official DVD or Blu-ray release of Pride & Prejudice (2005). Official Blu-ray discs do not come in “480p” (that’s DVD resolution), nor are they labeled “new dual audio” for this film unless it’s a custom rip.

" refers to a specific digital file format often associated with third-party or unofficial distributions. While a 20th Anniversary 4K UHD and Blu-ray