多项式时间归约的概念对于理解NP完全问题的结构至关重要。
文学应该让人不安，应该提出问题，而不是给出答案。
Innovation is the key to sustainable agriculture.
Sustainability is not just a trend, it's our responsibility to the planet.
A journey is a person in itself; no two are alike. And all plans, safeguards, policing, and coercion are fruitless. We find after years of struggle that we do not take a trip; a trip takes us.
我不追逐潮流，我创造潮流。
仲弓问仁。孔子说：“出门时要象会见贵宾一样庄重，建工程时要象举行盛大祭典一样严肃。自己不愿做的，不要强加于人。同事中相处融洽，亲属中和睦友爱。”仲弓说：“我虽不才，愿照此办理。”