把阈值降低到小于十分之一秒的值，实现特定于打字者的某些匹配。
Lower the threshold to a value less than one-tenth of a second to require certain matches specific to a typist.
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.
打字的时候，打字者因为没有记住键盘上各个字母的位置，只能找到一个键，按一个键。
Instead of relying on the memorized position of keys, the typist must find each key by sight.
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