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不好意思，在确认一下，我父母在中国呆了大于6个月小于一年，这次回美国入境时就显示绿卡就行了，是吗？
-Yes.

会不会入境时被刁难？
-Normally it is fine. If they IO asks, they may just explain it and provide the doctor/hospital proof, such as diagnosis and medical bills/payment, etc.
 
谢谢8老师了！