Dr Panno and his team found their recording angel in the form of stalagmites, the conical projections that grow on the floors of limestone caves.
潘诺博士和他的研究小组从研究石笋入手，石笋是生长在石灰洞地面上的圆锥状突出物。
A study carried out by Samuel Panno of the Illinois State Geological Survey and his colleagues has revealed that nearby caves store the dates of past earthquakes in stone.
伊利诺斯州地质调查局的萨缪尔·潘诺博士和他的同事进行了一项研究，研究发现震中附近山洞的石头上隐含着古代地震发生的日期。
A study carried out by Samuel Panno of the Illinois State Geological Survey and his colleagues has revealed that nearby caves store the dates of past earthquakes in stone.
伊利诺斯州地质调查局的萨缪尔·潘诺博士和他的同事进行了一项研究，研究发现震中附近山洞的石头上隐含着古代地震发生的日期。
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