它基于由苏珊·格雷提出的概念。苏珊·格雷在范德堡大学皮博迪学院工作，是早期儿童教育研究领域的传奇先驱。
It was based on concepts developed at Vanderbilt University's Peabody College by Susan Gray, the legendary pioneer in early childhood education research.
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。
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.
在不训练时，凯尔喜欢和格雷斯学院的同学们一起玩耍，他在学校里最喜欢的课程是历史和体育。
When he is not training, Kyle enjoys playing with his school friends at Grace Academy where his favourite subjects are History and PE.
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