Milton seems to have dug around rather carefully in his copy of the Faerie Queene, and he's come up with this illusion.

弥尔顿似乎极其小心地模仿着《仙后》,且他出现了这样一种幻想。

耶鲁公开课 - 弥尔顿课程节选

This was when you had this big track, and if you have wandered around different Greek cities that are dug up, some of them will have the hippodrome there, and you can see how huge they were.

里面是大型赛道，如果你参观过发掘出土的希腊城市，有一些会有赛马场，非常宏伟巨大。

耶鲁公开课 - 新约课程节选