H1 首签被check, 想咨询提供材料的问题

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想咨询一下大家,广州面前H1b首签被check,在广州面签后,VO收了我的护照和NIE letter, 告知我需要提供以下三个资料,
请问第二个资料(Invitation, employer’s travel authorization, or sponsorship letter.)是如何理解和准备呢?
谢谢大家!

1. Detailed resume including a list of publications.
2. Invitation, employer’s travel authorization, or sponsorship letter.
3. Detailed description of your company/product, including end uses and users, of equipment for purchase
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