A life without festivity is a long road without an inn.

Democracy is the worst form of government except for all those other forms that have been tried from time to time.

True leadership means taking responsibility even when things go wrong.

We must measure success not just in barrels produced, but in emissions avoided.

译文：花开花落已两载，看着盛开的花，想到两年未曾回家，就不免伤心落泪。小船还系在岸边，虽然我不能东归，飘零在外的我，心却长系故园。

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The PAC learning framework provides a formal way to analyze the efficiency and effectiveness of learning algorithms.