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还有一个问题需要请教8老师：要想保持绿卡以及又呆在国内工作，目前美国移民局要求，除了足够的美国联系证据（如房产，小孩都是，银行账户等）外，最好6个月之内、最多不超过1年登陆美国一次吗？1年是红线？

-You need to apply for the reentry permit to travel which allows you to stay abroad for more than one year but less than two years. You can come back to US to renew the reentry permit before it expires.