Tips: you can use the Google Webmaster Tool to find broken links and your 404 Not Found errors.

提示：你可以用Google Webmaster Tool来找出无效链接和404 Not Found errors。

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If you haven't been using this great tool yet, login to the Google Webmaster Tools, then add and verify your site.

如果你还没有使用这个强大的工具，登录到Google Webmaster Tools，然后添加并检验你的网站。

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