Learning is the process of modifying symbolic structures to improve performance.

Of all men's miseries the bitterest is this: to know so much and to have control over nothing.

过去总是紧张的，未来是完美的。

孩子们需要知道与众不同是可以的。

解释：不可因为个人喜欢而滥赏，不可因为个人恼怒而诛杀。