用这种方式打字的时候，打字者光顾着看键盘了，可能无暇关注屏幕上打出来的内容。

Use of this method may also prevent the typist from being able to see what has been typed without glancing away from the keys.

youdao

To the monkeys we show them the spots, to us, we will put up keys on the key board.

用猴子做试验的时候，我们给它们看那些点，我们给它们看那些点，我们是用电脑的键盘来做。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选