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;
前言：目的：探讨中学生在群发性食物中毒时的心理行为问题及防治对策。
Objective: to investigate the condition of psychological health among middle school students during outbreak of food poisoning and to explore measures to deal with this problem.
区域地质灾害的敏感性评价与诱发因素评价是区域群发性地质灾害预警预报的基础。
Regional landslide susceptibility assessment and evaluation of triggering factors are the basis of a landslide warning system.
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