穷人依靠勤劳与智慧艰难生存。温以凡和桑延做了几次

　　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)