Okay, the user sent "natural sources". Let me check the translation 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 explanations.
So, "natural sources" in Russian would be "естественные источники". I need to make sure that the original text isn't in Russian. Since "natural sources" is in English, I should translate it. There's no need for any explanations, just the translated text. Let me confirm the translation. Yes, "естественные источники" is correct. I'll output that.
естественные источники
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