It should not exceed eight (8) printed pages (double-spaced, typewritten 16 pages) 是什么意思？

大神求帮助！ 急求！

主要是不清楚 printed pages 和 typewritten pages 的区别？ 求高手帮助！！~~

double spaced：两行间距；行间距为二空格；双间距
　　双语例句：
　　1.Students are encouraged to write a brief essay (2 double spaced pages) in response to this question.
　　并且鼓励学生根据这些问题提出小论文（2页双倍行距）。

　　2.Assignments should be double spaced with standard 12 point font.
　　作业格式请以12点大小字型及双倍行距编辑。

　　3.Please write an essay approximately 12-15 pages long (double spaced). Theessay is due at the beginning of class #5.
　　请写出大约12-15页长的论文（双倍行距）。论文在第五堂课一开始时缴交。

　　4.The Ten Commandments are actually only five, double-spaced, and written in alarge font.
　　十诫只有五条，排版时用大字体、双倍行距。

我不会~~~但还是要微笑~~~：）