如果要在1分钟内评测数据库运行中断事件，那么必须每30秒进行一次抽样。
If you want to measure a database outage to a one minute resolution, that means you have to sample every 30 seconds.
应用该方法可以大大提高小概率事件的抽样效率，文中给出一组仿真结果对照。
Using the way, the sampling efficiency for small-probability events can be improved considerably, as can be seen from the contrasts shown in a group of results of simulation.
例如，根据奈奎斯原理，为了得到发生时间为20秒的事件的准确样本，那么必须每10秒进行一次抽样。
To get an accurate sample of an event that takes, for example, 20 seconds, samples must be measured every 10 seconds according to the Nyquist theorem.
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