The IdeaPad U-One Hybrid is a notebook computer, which has a removable screen that becomes a digital tablet.

VOA: special.2010.01.26

It's important for you guys to know that everything you write down in the notebook or blackboard as a symbol is actually a measured quantity.

其重要性就在于,你们要知道,你们记在本子上或者写在黑板上的任何物理符号,实际上都是测量量

耶鲁公开课 - 基础物理课程节选