今天我自己找到了一个相关答案同大伙分享，请进！

看这个链接：http://www.murthy.com/news/n_nscexp.html

NSC Expects I-140 Processing Times to Improve

At a meeting with members of the American Immigration Lawyers Association (AILA) on August 31, 2006, representatives of the USCIS's Nebraska Service Center (NSC) were asked why there has not been significant movement in their I-140 processing times in the last few months. The NSC responded that it had taken on a backlog of I-140 petitions from the Vermont Service Center (VSC), which slowed their I-140 processing. The NSC also reported that this backlog will soon be cleared and that, once it has cleared, they expect the I-140 petition processing times to improve dramatically.

这个网址上还介绍了很多同140相关的背景，希望对同我一样为140郁闷的朋友有所帮助。 同时也感谢-toosad-网友前天对我问题的解答。