contingencyn.偶发事件；偶然；依附条件，制约条件contingency requests临时请求contingency measures应急措施contingency strategy权变策略contingency scanning事故扫描contingency analysis应急分析contingency question后续问题contingency approach权变方法,随机制宜Contingency Exercise应急演习contingency provisio意外开支准备金contingency equation拟切方程