Okay, the user wants me to translate "stretcher-bed" into Persian. Let me check the rules again. The first rule says to translate all content into Persian. The second rule states that if the content is already in Persian, leave it as is. The third rule is to provide only the translation without any explanations.
So, "stretcher-bed" is an English term. I need to find the correct Persian equivalent. A stretcher-bed is a type of bed used for transporting patients, often in hospitals. In Persian, this is commonly referred to as "تخت نقلی" (takht-e naqli). Let me confirm that. Yes, "تخت نقلی" is the standard term used in medical contexts. I should make sure there's no other term, but I think that's correct. The user wants only the translation, so I'll just provide "تخت نقلی" without any extra text.