Okay, the user wants me to translate "active lifespan" into Korean. Let me think about the correct term here. "Active lifespan" can be translated as "활동 기간" which directly means "active period." However, depending on the context, there might be other translations. For example, if it's referring to the period during which something is actively used or functional, "활용 기간" could also be appropriate. But since the user hasn't provided additional context, I should stick with the most straightforward translation. Also, I need to make sure that if the content is already in Korean, I leave it as is. Since "active lifespan" is in English, I need to translate it. The user also mentioned to provide only the translation without any explanations. So, the correct response here would be "활동 기간" or "활용 기간" depending on the intended meaning. But to be safe, I'll go with "활동 기간" as the primary translation.
활동 기간
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