通过追踪该比率随时间的变化，他可以确定氡气到达地表需要花费多长时间，同时获得气体所通过的岩石的化学、热力学和机械状态。
By tracking this ratio over time, he can determine how long gas has taken to reach the surface and gain clues to the chemical, thermal, and mechanical state of the rocks the gas is passing through.
文中介绍了网络广告的主要形式，借鉴点击率和转化率，提出利用有效到达率来探讨网络广告真正到达有效受众的比率。
The paper introduces the main formats of online AD, taking CTR and CR for reference, and then discusses the proportion of effective accepter of online AD with the effective Arrival Rate.
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