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收到NVC 的电子邮件，信上定了广州面试的时间。因为申请的电子处理，信里说持此信件作为通知去面试，不知道父母还会收到从广州寄的邮包吗？
-Your parents should have also received the same NVC  interview appointment letter/package as the one your got. Did the interview appointment notice/letter list the required documents which your parents should provide for the interview? If yes, probably the US Consulate in Guangzhou will not send your parents another mail for the interview. So, your parents just bring the required documents listed in the NVC appointment notice for the interview on the schedule. Don't forget to bring the NVC interview appointment letter also.
Read this website for some information:
http://travel.state.gov/content/visas/english/immigrate/immigrant-process/interview/prepare/appointment.html