It has a stylus-operated on-screenkeyboard that takes great skill to master.
有由触笔操控的银幕键盘,需要很高的技巧去掌握。
《柯林斯英汉双解大词典》
2
Technically, what Wilson did was come up with an interface combining an Electroencephalogram, or brain wave monitor, with an onscreenkeyboard for selecting letters.