国际核安全事件分级表的4到7级则被官方称为“事故”，它们往往表示有一人或多人因遭受辐射而死亡——但也并非总是如此。
Levels 4-7 on the INES scale are officially called "accidents" and often, but not always, signal that one or more fatalities from radiation exposure have occurred.
另外在模型2中，23%经历冠心病事件的人被分级到高危，13%未经历冠心病事件的人被分级到低危。
An additional 23% of those who experienced events were reclassified as high risk, and an additional 13% without events were reclassified as low risk using model 2.
应用模糊重要度法对事故树基本事件进行排序，把导致火灾的两大因素进行模糊分级。
The paper also elaborates a theory of fuzzy mathematics and its application in coal mine production.
应用模糊重要度法对事故树基本事件进行排序，把导致火灾的两大因素进行模糊分级。
The paper also elaborates a theory of fuzzy mathematics and its application in coal mine production.
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