美国的签证和拒签齐默和世界上所有国家与地区一样（根据两国领事条约互免签证除外），入境美国或途经美国均需有有效的美国签证。从技术上讲，签证只是对“申请”进入美国的批准，每一个外国旅行者最终能否进入美国还要由美国入境口岸的移民局检察官作最终决定。从大的方... US Visa and Refusal Zimmer, like all other countries and regions in the world, except visa-based mutual visits under the consular treaty between the two countries, requires a valid U.S. visa to enter the United States or pass through the United States. Technically speaking, the visa is only an approval of the “application” into the United States, and ultimately whether each foreign traveler can enter the United States or the final decision of the immigration prosecutor at the U.S. port of entry. From the big side ...