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.
电脑的输入方式是有限的，在键盘上敲敲打打是很简单，但当我们想要画一幅画时可能就需要一个手写板了，即便如此也不如在纸上涂鸦方便。
I just arbitrarily grab a DSL driver circuit as below. However, it requires differential input. Is it the one you mentioned?
我随便找了个DSL的线路。但是这个要差分(音响说的平行)输入。你说的是这个吗？
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