translation.en: Yet the assumptions that quantum theory needs to make in order to deliver those predictions are so mysterious that even Feynman himself was moved to remark, "If you think you understand quantum theory, you don't understand quantum theory."
translation.zh: 然而量子理论为了实现这些预言所做出的假设 看起来是如此的不可思议， 以至于费曼本人都不得不这样评论， “如果你认为你理解量子理论了， 那你就没有理解它。”