Okay, the user wants me to translate "step-ladder" into Simplified Chinese. Let me think. The word "step-ladder" is a noun, referring to a type of ladder with steps. In Chinese, the common translation for this is "人字梯" (rén zì tī), which literally means "person-character ladder" because of the shape resembling the Chinese character for "person" (人). Alternatively, it might also be called "梯子" (tī zi), which is a general term for ladder. However, "人字梯" is more specific and commonly used when referring to a step ladder. I should check if there's any other possible translation, but I think "人字梯" is the most accurate. Since the user specified Simplified Chinese, I don't need to worry about traditional characters. Also, the user mentioned that if the content is already in Simplified Chinese, output it unchanged. But in this case, the original word is in English, so translation is needed. I should just provide the translation without any explanation, as per the instructions.