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请教专家：亲属移民第一次入境后，未拿到绿卡就回国，原入境签证（盖过入境章的移民签证）是否一年内有效？还能一年内再次入境？谢谢！！！

-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.