我google了一下，这个I-90form看起来是给那些已有绿卡但可以丢失或没收到用的，填了这表，交$290,加上一些需要的证明材料，就可以补办。所以我想是不是一入美国海关时，就要告诉移民局将要居住的地址什么的和其他信息，然后移民局在一定时间内就自己给你寄来绿卡卡片，也就是不用申请---纯属我自己的想象哦。
-You are right. When you enter into USA with your immigrant visa, passport, the documents given by the consulate sealed envelope given by the consulate. At the port of entry, after your basic interview you may be taken to the immigration office at POE where immigration officer will review the document and issue a I551 stamp ( temporary green card stamp) this stamp is valid for one year. You will receive an actual plastic green card via regular mail within few months.
第二个问题是回美证，应该是大于6个月但小于1年的话，到当地办公室在绿卡上盖个章就行；
-The green card stamp in the passport is valid only for one year, he can go to China and come back before the stamp expires if he has no the physical green card yet.
如果离开美国超过了1年，在这个情况下就要申请回美证。我的理解对吗？
-Yes, if he plan to stay outside US >one year< two years, he needs to apply for the reentry permit.
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-You are right. When you enter into USA with your immigrant visa, passport, the documents given by the consulate sealed envelope given by the consulate. At the port of entry, after your basic interview you may be taken to the immigration office at POE where immigration officer will review the document and issue a I551 stamp ( temporary green card stamp) this stamp is valid for one year. You will receive an actual plastic green card via regular mail within few months.
第二个问题是回美证，应该是大于6个月但小于1年的话，到当地办公室在绿卡上盖个章就行；
-The green card stamp in the passport is valid only for one year, he can go to China and come back before the stamp expires if he has no the physical green card yet.
如果离开美国超过了1年，在这个情况下就要申请回美证。我的理解对吗？
-Yes, if he plan to stay outside US >one year< two years, he needs to apply for the reentry permit.
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