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来源: 于 2015-12-14 19:55:33 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

No specific requirement, but you had better stay in China for more than one year before coming to US again. B-2 visa is for temporary visit, and you can  not use it to enter US too often. Otherwise, the CBP officer at the port of entry may not allow you to enter US.