863211/Pijiang老师

来源: 于 2010-12-22 04:44:44 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

Dear 863211/Pijiang,

I have a question, As a green card holder, how immigration officier knows when I left the US to another country? How do they know how long I stay overseas? When I passed the customs of US, do they record the dates of exits and entries while I passed the customs? But how do they record the date of leaving the country? 

Thanks very much!