The poor are not irrational; they are just as rational as anyone else, but they operate under very different constraints.
创造财富需要有创新的思维和勇于冒险的精神。
都说女儿是妈妈的小棉袄,可我是我妈的貂。
The security dilemma is a fundamental feature of international politics, as states' efforts to increase their own security often decrease the security of others.