兄弟姐妹類型的親屬移民簽證，剛得批準
丈夫的直係親屬，是主申請人，夫妻需要同時入境美國嗎？-Not have to, but the dependents cannot enter US before the primary beneficiary enters US.
丈夫是否可以先來，妻子在國內處理一些事情，後麵再到？
-Fine.
到美簽證有效期一年，如果期間辦好手續，夫妻能否先回國，拿到綠卡後郵寄回國內，再用綠卡回美國？
-After entering US using the immigrant visa, the immigrant visa will be endorsed (stamped) at the port of entry. This endorsed visa is equal to the temporary green card which is valid for one year. That means you can leave US and use this endorsed visa to reenter US within one year.
