Okay, the user wants me to translate "central vacuum" into Russian. Let me check the rules again. The first rule says to translate all content into Russian. The second rule states that if the content is already in Russian, leave it as is. The third rule is to provide only the translation without any explanations.
So, "central vacuum" is in English. I need to translate it. The term "central vacuum" refers to a central vacuum system, which is a type of vacuum cleaner system installed in a home or building. In Russian, the equivalent term would be "центральная вакуумная система". However, sometimes it might be translated as "центральный пылесос" as well. Let me verify which is more commonly used.
Looking up some references, "центральная вакуумная система" seems to be the more accurate and commonly used term in technical contexts. "Центральный пылесос" might be more literal but could be less standard. To be precise, I should use the first translation.
Also, the user mentioned that if the content is already in Russian, output it unchanged. Since the input is in English, translation is needed. I must ensure that I don't add any explanations, just the translation. So the correct response is "центральная вакуумная система".
центральная вакуумная система
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