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我父母485 pending,准备用AP回国， 已经订好机票明天走。昨天收到面试通知。我需要改机票吗？

-You had better do that.

如果申请面试改期，对他们的绿卡申请有影响吗？

-It is not a good idea. They will have more trouble if USCIS send a new appointment during their travel.

另外，通知上让带翻译。我是他们的petitioner, 可以兼翻译吗？

-Yes.