translation.en: So many people worked on it, but by the '40s, certainly by the '50s, this strange but very compelling idea of how to unify the laws of physics had gone away.
translation.zh: 曾经很多人致力于此研究，但从40年代，确切地说50年代起， 这个奇怪但引人入胜的课题 关于如何统一物理学法则的想法没落了。