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請教專家：親屬移民第一次入境後，未拿到綠卡就回國，原入境簽證（蓋過入境章的移民簽證）是否一年內有效？還能一年內再次入境？謝謝！！！

-Yes. The immigtration visa was void, but because it has been endorsed when entering US, it becomes a green card stamp. So, you can use it to reenter US within one year.