A fundamental question, for both social science and public policy, is whether the quality of life in a country like the United States is improving through the years.

对社会科学和公共政策而言，一个根本的问题是一个像美国这样的国家，其生活质量是经过多年的改善。

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A fundamental question, for both social science and public policy, is whether the quality of life in a country like the United States is improving through the years.

对社会科学和公共政策而言，一个根本的问题是一个像美国这样的国家，其生活质量是经过多年的改善。

youdao