Dr. David Dinges is a professor of medicine at the University of Pennsylvania in Philadelphia, and he works for NASA.
大卫•丁格博士是费城宾州大学的医学教授,现在在美国国家航空和航天管理局工作。
Very early risers and longtime night owls have a hard time ever changing, says David F. Dinges, chief of sleep and chronobiology at the University of Pennsylvania's Perelman School of Medicine.
宾夕法尼亚佩雷尔曼医学院睡眠和时间生物学主任大卫·丁格斯说,起得很早的人和长时间的夜猫子很难突然改变。
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