"Is that Tang Xiaotian again? Does he understand this kind of theory as well?"
Carl frowned. He hadn't expected Xiaotian to have figured this out too.
Kesha looked around and said, "Yes, he proposed it. I asked him once—doesn't space-time mean time and space? But he said he could separate them into the theory of time conversion and the theory of space interchange. Yet I never fully mastered it. Oh, and by the way, everything you've done is something he would never allow."
Chapter 413