有没有一种纸在上面写字肉眼看不到，得通过红外线

普通的纸就可以，只要墨水是无色的，大部分无色有机物质都具有独特的红外光谱特性、紫外光谱特性，用宽光谱或狭窄光谱的照射和和特定接受光谱的传感器，就能读出，一般是用荧光物质，一般植物的榨汁就有这个特性。
一般所说的吸收光谱特性就与此相关。
The next generation keyboard, future keyboard!
challenge and subverting the global computer keyboard, keyboard music instruments in 25 years ago，
The pioneer of the Chinese people firstly entered this area. who sent it into the modern house of CEO of Microsoft?
To challenge AT&T of the United States by improving communication deficiencies
Improving communication deficiencies, Chinese people challenge AT&T of the United States.