There was a flatspace near the door of the cavern.
洞窟门前有一块平地，是生火的好地方。
2
You all have a sense of what a flatspace is, Euclidean space is.
大家都多少知道平面空间是什麽，就是欧几里德空间。
3
Finally, we could rotate two overlapping flatspace dimensions further against each other, until they oppose each other's time progress and space dimensions.