如果美國綠卡持有者預期出國將超過一年,離開美國前應該申請“回美證”(re-entry permit),回美證的有效期是兩年
Also please read this info
http://www.uscis.gov/files/article/i131_biometrics_070808.pdf
Also please read this info
http://www.uscis.gov/files/article/i131_biometrics_070808.pdf