Often, in places, official marriage certificate is "一张纸" for which original information was maintained by record offices that has jurisdiction over the location where marriage took place and registered. You may want to refer to the link below for some guidance (related to marriage certificate issued in Hong Kong). http://travel.state.gov/content/visas/english/fees/reciprocity- I don't think you need to notarize an official document that's already bilingual IMHO, as there is nothing to translate.