An expert is a person who has made all the mistakes that can be made in a very narrow field.
专家就是在一个非常狭窄的领域里犯了所有可能犯的错误的人。
解释:第一次击鼓能振作士兵们的勇气,第二次击鼓可以使士兵们的勇气低落,第三次击鼓士兵们的勇气就消失了。
We must always be learning, because the field of computing is always evolving.