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.
Standard HTML provides a limited set of widgets: an input box, a button, and a hyperlink.
标准的HTML提供了小部件的有限集合：一个输入框、一个按钮和一个超级链接。
3
They may be limited in scope, dependent on human input and send their output to human brains, but they copy, select and recombine the information they handle.