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我父母去年4月份拿到綠卡，12月初回國。現家裏有些事情需要推遲歸期，這樣的話他們在國內滯留時間會有10個月左右，請問他們返美時會不會遇到麻煩？

-Normally it should be OK, but your parents had better not travel to China too often in the near future after they return.

要不要預先申請？