公共英语等级考试：二级阅读文章精选段落六

　　You cannot change the laws of physics …… but could physics actually enable us to travel through time? It might sound crazy, but according to Einstein's theories, there's no logical reason why time travel isn't possible and there are now scientists looking into it as a serious scientific proposal, at least at a theoretical level.

　　你无法改变物理学定律……但是物理学能否使我们在时间中旅行呢?这听上去或许像个痴想。但是根据爱因斯坦的理论，时间旅行在逻辑上不是不可能的。现在科学家正把它视为一个严肃的科学命题，至少在理论上如此。