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我是绿卡，现在人在中国。离开美国前申请了回美证，5月到期。我明白，我需要在到期前返美。我可以回到美国吼，马上再次申请新的回美证吗？

-Yes.
回美证可以延期？延期和申请新的区别是什么?-Same thing.

另外再确认一下，回美证必须要打了指纹才可以离开美国对吧？

-It is better to do it before you leave. You may request expedited processing for biometrics which takes about 10 to 14 days. See: 

Biometrics Appointments for Reentry Permit Applicants Living Overseas | Chodorow Law Offices (lawandborder.com)

非常非常感谢