所谓不可抗力，是指合同订立时不能预见、不能避免并不能克服的客观情况。包括自然灾害、如台风、洪水、冰雹；政府行为，如征收、征用；社会异常事件，如罢工、骚乱三方面。
被告可以通过证明损失系由原告自己或不可抗力因素造成而免除自己的责任。
The defendant can excuse himself by showing that the loss was owing to the plaintiff or the act of God, or vis major (a great or superior force).
除非不可抗力因素，原本本源有权拒绝接受全部或部分退款、延期或转让申请。
Unless force majeure, Shriessence has the right to reject any application for refund, extension or assignment.
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。
The influence of uncontrollable factors, such as emergency and earthquake, on post VRP also has been analyzed.
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