Milton has dug up a gem from the pages of The Iliad, and this gem has something like a Medusa effect on the poem or perhaps on us as readers. Time almost seems to stop when we begin appreciating this image solely on aesthetic grounds.

弥尔顿从《伊利亚特》中挖出了一块瑰宝，这块瑰宝对于诗或我们读者起得作用,如同美杜莎一样，在我们只欣赏着,精美绝伦的地面上的场景时，时间仿佛停止。

耶鲁公开课 - 弥尔顿课程节选

If that's all it knows, then in that scenario there is no building or anything else; it continues a trajectory both forward in time and backward in time, and it says that whatever seconds, one second before you set your clock to 0, it would've been on the ground.

如果是这样,在那种模式下,没有楼房或者别的什么,物体的运动轨迹可以沿时间可以向后延伸,也可以向前延伸,不管时间取什么值,在零点前一秒时,物体就在地面上

耶鲁公开课 - 基础物理课程节选