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请问哪位朋友知道：如果不想入美国籍，只想保持婚姻绿卡，是要求每年至少半年在美国，还是至少半年登陆美国一次？
-The green card is for you to live in US permanently, not for you to use it as border-crossing card, so it you go back and forth between China and US too often, your green card probably will be cancelled.