求翻译：Welcome to this official United States visa information source. The Visa section of this website is all about U.S. visas for foreign citizens to travel to the U.S. Before traveling to the U.S., a citizen of a foreign country must generally obtain a nonimmigrant visa for temporary stay or an immigrant visa for permanent residence. The type of visa you will need is based on the purpose of your travel.是什么意思？

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