回複：綠卡身份保持

the safest rule is staying ouside US for less than 6 month within one year and applying reentry permit. Other than that you are suject intention accessment(no intention to abandon your residency) which is very subjective ( you are screwed, when you encounter ***** )

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谘詢, 保持移民身份, 無居留入籍, 雙重國籍, 保持中國護照