莱尔估算地质年代的方法不是很准确。
Lyell's strategy for estimation of geologic dates was not very accurate.
经过漫长地质年代的溶滤作用是控制深层地下水中氟含量的主要地球化学作用。
Lixiviation is chief geochemistry action to control fluorine content undergo very long geological age.
同时因为计算与实验室的实验复制的金星地表与大气层的活动，表明辐射率一直在下降，所以辐射率能够成为某个地质年代的一个重要指标。
Because calculations and lab experiments replicating the Venusian surface and atmosphere show that emissivity decreases over time, emissivity can be an important indicator of a substance's age.
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