现有英文输入用键盘的字母区布局基本上沿用QWERTY英文机械打字机布局，在英文输入中存在输入困难、速度慢、输入易疲劳等缺点。
The current alphabet area of keyboard for English input fundamentally follows the QWERTY layout of mechanic typing machine , which has the defects of difficulty in input , low speed and fatigue during typing .
机械打字机