出境到底需要带哪几种文件？帮我看看学校的提示

dsplllUID: 2335268

签证，护照，I-20，SEVIS票据，amission letter.就这些吧。还有别的什么文件吗？学校那边说让我带一些证明资金的文件，那是什么呀？我就打算带点现金就行，学费什么的打算家人电汇给我。如果要求出示资金来源，怎么办？

下面两段是学校发给我的关系入境需要带的文件，帮我看看，


1。When you receive your nonimmigrant visa at a U.S. embassy or consulate,
the consular officer may seal your immigration documents in an envelope
and attach it to your passport. You should not open this envelope! The
Customs and Border Protection (CBP) Officer at the U.S. port of entry
will open the envelope.   这是指I-20吗？可是没有密封啊

2。 Here are the
documents you should carry with you:

-Passport (including attached envelope of immigration documents, if
applicable)
-SEVIS Form I-20 or DS-2019
-Evidence of financial resources

资金证明的东东是指什么呀？如果身上没带足够的钱呢？

kinglUID: 2147956

你签证要了资金证明没，估计就是那个吧