do i need to apply the 回美證 now? (i may leave US for more than 1 year)
how long can i leave US ? Can it be more than 1 year without 回美證?
i have relatives in US , so can they help me to apply the 回美證 later after i have left US?
please help!!
更新1:
also, Where and How to apply the 回美證? (if i need to apply here by myself....)