Usually, taking notes by hand on paper books takes longer than typing notes out on digital devices.
通常，在纸质书上用手写笔记比在电子设备上打字更费时。
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Input methods are limited. Typing on the keyboard is easy, but if you want to draw pictures - well... you could grab a graphics tablet, but that's not as simple as just sketching things on paper.
We can do things; here’s another example. What I really want is while I’m typing a paper I want the computer to tell me what I should have been writing instead.