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已有綠卡，上周提交了回美證申請（reentry permission），想請問在收到收件通知以後，並且在收到打指紋通知之前，可以離境回中國嗎，然後等到打指紋的時候再回來？

-Yes. Sometimes USCIS may use your old biometrics in the system for the reentry permit, so you may not need to do the biometrics in this case. If USCIS send you the appointment for biometrics,, you can come back to do it.