Think of it like a DVD menu. You press one button, and you hear Tom Holland speak English. You press another button, and you hear the same actor speaking Portuguese (dubbed by a local voice artist). The video doesn’t change. The lips might not sync perfectly, but the story remains the same.
You can have a 5.1 Surround file that is English-only. You can have a Dual Audio file that sounds like a tin can. They are different superpowers. oq e dual audio