科学新发现：我们的1秒钟将变长了！
<p><span word="We">We</span> <span word="all">all</span> <span word="know">know</span> <span word="time">time</span> <span word="is">is</span> <span word="a">a</span> <span word="construct">construct</span>, <span word="and">and</span> <span word="right">right</span> <span word="now">now</span>, <span word="it">it</span>'<span word="s">s</span> <span word="kept">kept</span> <span word="by">by</span> <span word="the">the</span> <span word="very">very</span> <span word="precise">precise</span> <span word="tick">tick</span> <span word="of">of</span> <span word="an">an</span> <span word="international">international</span> <span word="network">network</span> <span word="of">of</span> <span word="around">around</span> 500 <span word="atomic">atomic</span> <span word="clocks">clocks</span>.</p><p>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。</p><p><span word="But">But</span> <span word="now">now</span> <span word="researchers">researchers</span> <span word="have">have</span> <span word="shown">shown</span> <span word="that">that</span> <span word="time">time</span> <span word="could">could</span> <span word="be">be</span> <span word="kept">kept</span> <span word="even">even</span> <span word="more">more</span> <span word="accurately">accurately</span> <span word="with">with</span> <span word="a">a</span> <span word="new">new</span>-<span word="generation">generation</span> <span word="of">of</span> <span word="clocks">clocks</span> <span word="called">called</span> <span word="optical">optical</span> <span word="clocks">clocks</span>, <span word="and">and</span> <span word="they">they</span> <span word="want">want</span> <span word="to">to</span> <span word="use">use</span> <span word="the">the</span> <span word="new">new</span> <span word="system">system</span> <span word="to">to</span> <span word="redefine">redefine</span> <span word="a">a</span> <span word="second">second</span> - <span word="which">which</span> <span word="would">would</span> <span word="mean">mean</span> <span word="we">we</span> <span word="could">could</span> <span word="squeeze">squeeze</span> <span word="even">even</span> <span word="more">more</span> <span word="into">into</span> <span word="our">our</span> <span word="days">days</span>. <span word="The">The</span> <span word="optical">optical</span> <span word="clock">clock</span> <span word="they">they</span>'<span word="ve">ve</span> <span word="just">just</span> <span word="measured">measured</span> <span word="is">is</span> <span word="so">so</span> <span word="precise">precise</span> <span word="that">that</span> <span word="it">it</span> <span word="would">would</span> <span word="have">have</span> <span word="lost">lost</span> <span word="less">less</span> <span word="than">than</span> <span word="two">two</span> <span word="minutes">minutes</span> <span word="if">if</span> <span word="it">it</span> <span word="had">had</span> <span word="been">been</span> <span word="running">running</span> <span word="since">since</span> <span word="the">the</span> <span word="birth">birth</span> <span word="of">of</span> <span word="the">the</span> <span word="Universe">Universe</span>, <span word="which">which</span> <span word="is">is</span> <span word="pretty">pretty</span> <span word="incredible">incredible</span> <span word="once">once</span> <span word="you">you</span> <span word="wrap">wrap</span> <span word="your">your</span> <span word="head">head</span> <span word="around">around</span> <span word="it">it</span>.</p><p>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。</p>
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