看來你是兩眼一抹黑，又懶得自己上網查。看這裏移民局的要求：

Please submit certified translations for all foreign language documents. The translator must certify that s/he is competent to translate and that the translation is accurate.

The certification format should include the certifier's name, signature, address, and date of certification. A suggested format is:

Certification by Translator

I [typed name], certify that I am fluent (conversant) in the English and ________ languages, and that the above/attached document is an accurate translation of the document attached entitled ______________________________.

Signature_________________________________
Date Typed Name
Address

www.uscis.gov/forms/forms-and-fees/general-tips-assembling-applications-mailing