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).

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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.

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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.

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