我上次问过这个问题，得到你们热情的回答，很感谢。
我是NIW，140 已批，485 收到RFEs.信中要求“submit a letter and/or other documentary evidence which establishes that you will continue to be engaged in the occupation of which the NIW is based. This evidence shall specify how you intend to serve the national interest and confirm that you intend to carry out the terms and conditions of the underlying _140 petition."
请问这就是 emloyment letter 吗？必须是currently emlpoyment letter 吗？其他证据比如future employment letter in the same field,或140 后发表的paper 可以吗。因为我现在没有工作，恳请各位帮忙出出主意。不胜感激。