求翻译：本文以典型案例为基础，研究突发事件下人的行为对粮食安全的影响，提出了突发事件下粮食需求畸变为相对超额需求和绝对超额需求两种不同类型的超额需求，探讨相关形成机理，并提出相应的危机管理政策建议。是什么意思？

This article is based on typical cases to study emergency human behavior impacts on food security, introduced under the emergency food needs during orthodontic becomes relative and absolute excess demand excess demand for two different types of excess demand, discussion on the formation mechanism, and make recommendations for appropriate crisis management policy.