Dear Nianrong, hope this is what you are asking for:  http://www.claymath.org/sites/default/files/ezeta.pdf

Thank you @Cj. That's Riemann's paper. What I want is C.L.Siegel article. Now, I've translated it into Chinese.

Dear Nianrong, an English translation for Riemann's Collected Papers is at Amazon where shipping is $6 less than from the publisher.

All the best.

Dear @Cj,thank you. in Riemann's thesis without his nachlass. I have translated C.L.Segel's article into Chinese.

That is great, Nianrong!  Thanks for raising your question in the first place.  When my Riemann copy arrives, I might finally understand your comments better.  Take care.

Dear @Cj, thank you again for your concern and support. My English is poor, the language is not accurate, please forgive me.

Nianrong, Sorry I am late to see your post, my Riemann Collected Papers arrived.  English is made up of all cultures through history.  It is mind-expanding to have yours added to the language, and so your English is amazingly excellent.  I would be nowhere without translators such as yourself or Riemann's, so please forgive me!