Okay, the user sent "add base". Let me check the translation rules again. The first rule is to translate all content into Simplified Chinese. The second says if it's already in Simplified Chinese, leave it as is. The third is to provide only the translation without explanations.
So, "add base" is in English. I need to translate it into Simplified Chinese. The direct translation would be "添加基础" or "增加基础". But maybe the user is referring to something specific, like adding a base in a game or a technical term. However, without more context, the most straightforward translation is "添加基础".
Wait, the user might be using "base" as a noun here. So "add base" could be "添加基础" or "增加基础". Both are possible. I'll go with "添加基础" as the translation. Let me make sure there's no existing Simplified Chinese content here. Since the original is English, I need to translate it. So the output should be "添加基础".