Okay, the user wants me to translate "polite expression" into French. Let me check the rules again. The first rule says to translate all content into French. The second rule states that if the content is already in French, leave it as is. The third rule is to provide only the translation without any explanations.
So, "polite expression" in French would be "expression polie". I need to make sure there's no other possible translation. Maybe "expression courtoise" could also work, but "polie" is more commonly used for "polite" in this context. Let me confirm. Yes, "expression polie" is the standard translation. The user didn't specify any particular context, so the direct translation should suffice. Also, since the original isn't in French, I don't need to leave it unchanged. Just output "expression polie" without any extra text.
expression polie
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