examples of the absoluteness include the principle of invariance for velocity of light, the principle of special relativity, the principle of general relativity, eigenlength, eigentime, minkowski four dimensional space-time 在教學(xué)中常常強(qiáng)調(diào)其中的”相對(duì)”,而忽視了相對(duì)論中還有“絕對(duì)”的一面,如光速不變?cè)?、狹義相對(duì)性原理、廣義相對(duì)性原理、本征長(zhǎng)度、本征時(shí)間、閔可夫斯基四維時(shí)空等都具有絕對(duì)性。