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The concept of polynomial-time reduction is central to understanding the structure of NP-complete problems.
你知道的——当一个人情绪低落的时候,他会格外喜欢看日落。
A real decision is measured by the fact that you've taken a new action. If there's no action, you haven't truly decided.
The molecules that mediate pain are ancient, revealing how deeply rooted this sensation is in evolution.