再请教一下，如果申请公民，一定要等到拿到公民纸才能出国吗，
-Yes and get the US passport unless you renew your green card before you get the US citizen.
还是想申请绿卡一样，可以有个临时stamp出国可以回来呀，
-No. But if you file I-90 to renew your green card, you can bring the I-90 receipt notice to get the green card stamp at the local USCIS office if you leave US before you get the new green card. If you don't file I-90, then you can not get the green card stamp.
Of course, if you travel and come back before your current green card expires, then you can use this green card to come back (not need to renew it).
好像网上说公民要5个月或更多。
-Yes and get the US passport unless you renew your green card before you get the US citizen.
还是想申请绿卡一样，可以有个临时stamp出国可以回来呀，
-No. But if you file I-90 to renew your green card, you can bring the I-90 receipt notice to get the green card stamp at the local USCIS office if you leave US before you get the new green card. If you don't file I-90, then you can not get the green card stamp.
Of course, if you travel and come back before your current green card expires, then you can use this green card to come back (not need to renew it).
好像网上说公民要5个月或更多。
