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收到advance parole批准通知可以离境吗？
-What kind of 批准通知 did you received, I-797 Approval Notice? Normally USCIS should mail the AP to you when they approved it, not just a 批准通知. The AP should contain your photo. You can leave US after the AP is approved even if you don't receive the AP yet, but you need to ask someone to mail it to you in China so that you can use it to come back (Be careful it may be lost it during the mail).

还是必须等advance parole文件来才能离境？