如果发生异常事件或是不能与任一个第三方完成事务，Web服务必须保证能回到前一个状态。

If an exception process occurs or can't complete the transaction with any one of the third party providers, the web service has to make sure to go back to the previous state.

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然后，通过将报告同百分点报告进行可视化的比较，您就能够轻易的看到任意时刻异常事件发生的情况。

Then, by visually comparing the reports with the subsequent Percentile Reports, you can easily tell when any anomalies occur.

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监测发生的异常事件，比如群发性严重呼吸道疾病或者死亡；

monitoring for unusual events, such as clusters of severe respiratory illness or death;

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