All pages return 404 but no URL problems can be found

This is a brand-new WordPress site I had just been working with. I had installed it successfully on an nginx server, but with neither .htaccess modifications, nor header changings, no pages or articals can be found, and to my interest the wp-login.php, the home page, and the searching pages (e.g. can be easily shown – as a non-404-page, of course.
Hope there’s someone to tell me what’s wrong and thanks a million!

The page I need help with: [log in to see the link]

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