Okay, the user wants me to translate "natural sources" into Portuguese. Let me check the rules again. The first rule says to translate all content into Portuguese. The second rule states that if the content is already in Portuguese, leave it as is. The third rule is to provide only the translation without any explanations.
So, the input here is "natural sources". Since it's in English, I need to translate it. The direct translation would be "fontes naturais" in Portuguese. I should make sure there's no context that might change the translation, but the user didn't provide any additional info. Just a straightforward translation. No need to add anything else. Let me confirm that "fontes naturais" is the correct term. Yes, that's the standard translation for "natural sources" in Portuguese. Alright, that's all. Just output the translation.
fontes naturais
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