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。

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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。

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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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