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一份不允许我用武力捍卫自己免受攻击的契约总是无效的。
A covenant not to defend myself from force, by force, is always void.
我们需要设计考虑到人类心理的政策,而不仅仅是经济理论。
The goal of behavior is always the reduction of some drive or need.
The best way to learn mathematics is to do mathematics.