due to the severity of this phenomenon,we have no alternativ

英语翻译
The likelihood of occurrence and severity of the same is important for the assessment of the risk presented by the hazard to the food supply chain.

一句英语的逻辑上的理解
在公司文档上有英语：
no action is required unless severity is 10
现在我们想知道severity=10的时候是否必须采取行动.
同事们认为必须采取行动,我认为是可以采取行动,也可以不采取行动.但我没法说服别人.
我的理由：
设severity is 10 为A,action is required 为B
我认为 unless = if not
则文档中规定：if not A,then not B
从这句话是推不出 if A then B 的.
不知道我的理解是否正确,如果正确,该怎样说服别人.

英语翻译
But the epidemic is “ moderate ” in severity,according to Margaret Chan,the
organization’s director general,with the overwhelming majority of patients
experiencing only mild symptoms and a full recovery,often in the absence of any
medical treatment.

翻译中文
Stopping distances and severity of crashes:
1.Decrease as vehicle speed increases
2.Are not affected by vehicle speed
3.Increase as vehicle speed increases 什么意思？

英语翻译
The analyses of earthquake severity allow scientists to estimate the locations and likelihoods of future earthquakes,helping identify areas of greatest hazard and ensure safety of people and infrastructure located in such areas 各位大虾我没钱勒...帮下忙好么.