也许你可以把书本上的一切知识都装入脑中，但知道在何时应用何种规则，这才是真正高手的标志。
You may be able to keep all the knowledge in your head, but knowing when to apply which rules is the mark of a true professional.
想度过快乐和充实的一生，我们不但需要加强自己的自我控制能力，而且也需要提升自己的才智，知道在何时、何地运用自己的自我控制能力。
To live happy and productive lives, we need to develop not only our self-control strength, but also the wisdom to make good decisions about when and where to apply it.
我们永远也不会知道这种计算能力是何时、如何发展起来的，但可以肯定的是，在人类形成半永久定居点的时候，这种计数法已经发展得很好了。
It will never be known how and when this numeration ability developed, but it is certain that numeration was well developed by the time humans had formed even semi-permanent settlements.
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