坚韧求生，勤劳致富。超凡序位

　　Homelessness, hunger and shame: poverty is rampant in the richest country in the world. Over 40 million people in the United States live below the poverty line, twice as many as it was fifty years ago. It can happen very quickly. 　　Many people in the United States fall through the social safety net. In the structurally weak mining region of the Appalachians, it has become almost ... (展开全部)