It occupies the theme of the middle three books books III through VI.

它是本书中段三册的主题,从第，III，到第，VI，册。

耶鲁公开课 - 政治哲学导论课程节选

Now, I look around this room, I don't see anybody whose head is three times bigger than mine, so I know that you cannot digest everything the books have.

我在教室里扫了一遍,没看见谁的脑袋比我大三倍,我知道你们是不可能看完这本书的

耶鲁公开课 - 基础物理课程节选