SEO impact: Choosing a primary domain will help avoid duplicate content.
对搜索引擎优化的影响：选择一个主域名将有助于避免重复内容。
You should place it in your root directory and include instructions that will help you to avoid duplicate content and will optimize the crawling of your website.
你应该把它放在根目录下，里面包含可帮你避免重复内容和优化你的网站的指导。
If you are in the fortunate position of helping out with the structure of a new website, take the chance to make sure you avoid situations where you could get duplicate content.
这恐怕不是这个标签设计的初衷吧，如果你有幸帮助规划一个新网站的结构时，抓住这个机会确保你能避免产生重复内容。
If you are in the fortunate position of helping out with the structure of a new website, take the chance to make sure you avoid situations where you could get duplicate content.
这恐怕不是这个标签设计的初衷吧，如果你有幸帮助规划一个新网站的结构时，抓住这个机会确保你能避免产生重复内容。
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