图1：正态概率分布函数，它表明实际的观测值可能会偏离期望值(或者平均值)。

Figure 1: Normal probability density function, which illustrates that actual observations may vary from the expected (or average).

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因为宇宙已存在137亿年，宇宙扩张相应的延伸距离137亿光年则是任何方向可能观测到的最大值。

The universe being 13.7 billion years old, 13.7 billion light-years—duly stretched to allow for the expansion of the universe—is the maximum distance it is possible to see in any direction.

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基于观测到的数据猝发到来之间时间间隔，取平均值获得可能的呼吸间隔值；

Based on the inter-arrival time of data packets obtained from the learning function, the mean of these inter-arrival time is the possible sniff interval;

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