給點建議I-140 補充材料

移民局的信這樣寫:
Sibmit evidence to establish how the benefit you are to impart is to be national in scope. How will your research be national in scope? Is anybody using your ideas? what effect will your proposed work in the united states have on the united states as a whole?
Please submit documention that shows "substantial prospective benefit" to the national interes and sepcifically sets the benficiary as apart from the beneficiary prospective field not just as a graduate student.
請問朋友們, 有沒有這樣的情況?你們怎麽處理?補充了什麽樣的材料?有appeal letter 的樣本嗎?