回复：2D Barcode for Form I-131

请教一下。看到I-131的INSTRUCTION里面提到 2D BARCODE field on the bottom of each page. 我从USCIS网站下载的表格，可是根本看不到什么BARCODE, 这是怎么回事？

甚至我连打印这个表时候，页面最下方的Form I-131 03/22/13 N 都打印不出来。但打印机打印其他表格都没有问题。
- Did you get it from the following website? I just tried it and it worked well. You may down load the form, save it into your computer, and then complete it and print it out. You may try another printer.

http://www.uscis.gov/files/form/i-131.pdf
 

请教老师是怎么回事？