Eb1a，不明白“Copy of I-797C: Approval Notice for My I-140 (NIW);

我是想办理eb1a快速审理，提交I-140和I-907并同时交费，然后所有材料都是纸质提交，不准备e-file I-140。（这样是不是可以？）

我在网上找了一个模板，应该是eb1a申请的cover letter，因为信开始有如下内容

Re.:     EB1-A Petition for Permanent Residency under the category of Alien Worker of Extraordinary Ability
                      Petitioner/Beneficiary: Dr. XX
                      Classification Sought: §203(b)(1)(A)
                       Type of Petition: I-140

现在我不明白下面内容的第一点，为什么I-140后面加括弧(NIW)，NIW和eb1a不是两种不同的申请类型吗，另外，I-797C是什么，多谢。

Please find enclosed the following documents in supporting my immigration petition.

1. Original signed form I-140, filling fee in the amount of $580 made payable to the Department of Homeland Security and Copy of I-797C: Approval Notice for My I-140 (NIW);

2. Original signed form I-907, and filling fee in the amount of $1225 made payable to the Department of Homeland
Security;

      3. Petition Letter (detailed list of supporting documents enclosed);

     4. Documentation at corresponding exhibits demonstrating my eligibility for permanent residence status (Please see list of INDEX OF EXHIBITS for details).

      5. Certification of translation.