这个程序可以将这些以及数以千计的其它字母组合提取出来，并且在需要的时候将其恢复。

A good program takes out these and thousands of other combinations of letters and restores them when needed.

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在另一项任务中，学生们必须记住四个字母，在某个字母每次闪过显示屏时按下按钮，而其它字母闪过时则不按按钮。

In another task, they had to remember a series of four letters and were told to press a button each time one flashed on a screen and not to press the button when other letters flashed.

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我们正位于的黎波里上空，雷达探测到的其它信号在显示器上以字母和数字标出。

We are over Tripoli.And we are not alone.The radar detects other signals that on the screen become letters and Numbers.

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