Usually you can translate yourself, but you need to go to Public notary office to get a notary seal. For most of the document in Chinese, this is the case. But I don't know if it apply to your case.
回复:请帮助: 对I-485 上的那个党员问题我回答了“YES”
所有跟帖:
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did you mail the I-485 form?
-stone01-
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07/11/2004 postreply
21:11:21
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Public notary office?? No, no,
-No,no,no`!-
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07/12/2004 postreply
06:49:03