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常识告诉我们,一个试图征服我们的国家是所有国家中最不适合保卫我们的。
In international trade, a country should specialize in the production of goods for which it has a comparative advantage, and trade with other nations to maximize overall economic welfare.
The world is a stage, but the play is badly cast.
The curious paradox is that when I accept myself just as I am, then I can change.
心理学家必须是一个严格的实证主义者。