BTW, do you have official documents about

来源: 于 2009-06-30 20:18:09 [旧帖] [给我悄悄话] 本文已被阅读：次

"come back within 30 days, you are not considered as leaving U.S."? I'd like to read it,so that next time if I go Canada, I can show the document to immigration officer.