确实，在过去的150年中，《格雷解剖学》——1858年的教科书，其中有类型的定义——主要是这样划分躯体的：神经系统、循环系统和消化系统等等。

Indeed, for the past 150 years "Gray's Anatomy" -the 1858 textbook that defines the genre-has dissected the body along these thematic lines: nervous, circulatory, digestive and so on.

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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.

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我们和李雷学的科目一样。

We are learning the same subjects as Li lei's.

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