Okay, the user wants me to translate "knee-length" into Traditional Chinese. Let me check the rules again. The first rule says to translate all content into Traditional Chinese. The second rule states that if the content is already in Traditional Chinese, output it unchanged. The third rule is to provide only the translation result without explanations.
So, "knee-length" is an English term describing something that reaches the knee. The direct translation would be "及膝的" in Traditional Chinese. I need to make sure there's no existing Traditional Chinese content here. Since the input is in English, I should translate it. No explanations, just the translation. Let me confirm that "及膝的" is the correct term. Yes, that's the standard translation for "knee-length" in Traditional Chinese. Alright, that's the answer.