Look at the "Automatic Revalidation Fact Sheet" inside the page

来源: 于 2014-10-01 13:19:41 [旧帖] [给我悄悄话] 本文已被阅读：次

"...For more information about automatic revalidation provisions and reentry to the U.S. visit the Automatic Revalidation Fact Sheet ...."

It's a pdf link