They are the external or uncontrollable factors.
它们是外在,无法控制的因素。
It was a mixture of controllable and uncontrollable factors.
这是一个可控和不可控因素的混合物。
The influence of uncontrollable factors, such as emergency and earthquake, on post VRP also has been analyzed.
同时对突发事件和地震等不可抗力因素对邮件车辆路径问题的影响进行了分析。
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