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We all know time is a construct, and right now, it's kept by the very precise tick of an international network of around 500 atomic clocks. 我们都知道时间是个复杂的概念。目前，世界上有一个由大约500台原子钟组成的网络，而我们就通过这些原子钟精确的滴答进行计时。 But now researchers have shown that time could be kept even more accurately with a new-generation of clocks called optical clocks, and they want to use the new system to redefine a second - which would mean we could squeeze even more into our days. The optical clock they've just measured is so precise that it would have lost less than two minutes if it had been running since the birth of the Universe, which is pretty incredible once you wrap your head around it. 但是现在研究人员表示，新一代钟表——光学钟——可以更准确地计时，而且他们想用新系统来重新定义一秒钟的长度，这也就意味着我们的日子里甚至可以挤进去更多光阴。刚刚测量的光学钟非常精确，如果它从宇宙诞生之日起开始运行的话，到现在误差还不到两分钟，仔细想想简直不可思议。 | 
