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来源: 于 2019-03-10 11:27:36 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

也没有护照上盖章，那以后入境美国的时候，海关知道我离开美国多久了吗？目前绿卡。

-Yes. They have their tracking system. But you need to make your own record for the abroad trip for future US citizenship application (if any).