and you cannot go out in public,

而你不愿意在公共场合露面，

I feel like 课堂 - SpeakingMax英语口语达人

There's only one occasion where it helps to go to three dimensions because there are certain things you can do in 3D you cannot do in less than 3D.

只有一种情况下进入三维是有意义的,因为有些事情你能在三维空间内完成,但低于三维就做不到了

耶鲁公开课 - 基础物理课程节选