特温格和她的同事们想要了解为什么平均幸福感会发生这样的变化。
Twenge and her colleagues wanted to understand why this change in average wellbeing occurred.
辉格党和民主党对市场、银行和商业带来的变化持有不同的态度。
Whigs and Democrats held different attitudes toward the changes brought about by the market, banks, and commerce.
约翰霍普金斯大学布隆伯格公共卫生学院的社会流行病学家托马斯·格拉斯说：“大多数专家都认为这些变化与环境有关。”
"Most experts agree that the changes were related to something in the environment," says social epidemiologist Thomas Glass of The Johns Hopkins Bloomberg School of Public Health.
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