时间上 广州 和 美国 有什么不一样 ？
-The process takes more time for immigrant visa application in China more than filing I-485 within US.
手续上 广州 和美国境内 有什么不一样 ？
-In Guangzhou, it is an immigrant visa application. After you get the immigrant visa, you can use it to enter US to become a green card holder directly.
In US, you need to file I-485 to adjust your non-immigrant status to immigrant status (become a green card holder).
