轻薄版：
更简约更优雅的转轴。键盘被大屏幕取代（我只是不想再做一遍键盘了）可实现裸眼2D。
Thin version:
More simple and elegant rotating shaft. The keyboard has been replaced by a large screen (I just don't want to do the keyboard again) and can be 2D with naked eyes.
