Okay, the user wants me to translate "leaf stem" 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, "leaf stem" is in English. I need to translate it. The correct Russian translation for "leaf stem" would be "черешок листа". Let me confirm that. "Черешок" is the stem of a leaf, and "листа" is the genitive case of "лист" (leaf). That seems right. I should make sure there's no other possible translation. Maybe "стебель листа"? Wait, "стебель" is more like a stem in general, but in botanical terms, "черешок" is the specific term for the leaf stalk. So "черешок листа" is accurate. Alright, that's the translation. I'll output it without any extra text.
черешок листа
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