事件：路易斯·巴斯德(要庆祝巴斯德)因发现微生物衰变而闻名(藏匿了许多个世纪的失去的东西被找回来了)。
What happened: Louis Pasteur (Pasteur will be celebrated) is credited with discovering microbial decay (lost thing is discovered, hidden for many centuries).
根据保存这些化石的岩石层里铀衰变率的基础上所确定的年代，那次掉入洞穴事件发生在197.7万年前。
That fall into the cave happened 1.977 million years ago, according to dating based on the rate of decay of uranium in the rock layer that holds the fossils.
但是，比较罕见的三轻子和四轻子事件却暗含着有一个复杂的级联衰变，这是很难解释的。
But the rarer three-and four-lepton events suggest a complex cascade of transformations that may prove difficult to unravel.
没有质子被观测到如此衰变，显示出这样的事件很少见。
The fact that no proton has been seen to do so suggests such events are exceedingly rare.
没有质子被观测到如此衰变，显示出这样的事件很少见。
The fact that no proton has been seen to do so suggests such events are exceedingly rare.
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