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The beauty of mathematics lies in its ability to reveal hidden symmetries and truths.
工资与就业之间的关系并不像某些模型所暗示的那样简单。
States are inherently aggressive and expansionist because they exist in an anarchic international system where there is no higher authority to keep them in check.
A man is a success if he gets up in the morning and gets to bed at night, and in between he does what he wants to do.