急问 我和我老公的I-131都approved 了,我们收到的回美国时间是 .“Presentation of the orginal of this document prior to October 02,17 allows a Customs and Border Protection Inspector at a port-of-entry to prole the named bearrer, whose photograph appears hereon ,into united states based upon urgent humanitarian reasons or significant public benefit.” 意思是10/02/17前这段都可以回国,只要在10/02/2017 前回美国就可以了吗? 回国大概能呆多久?能回国几次, 谢谢