求翻译：外部不可预见风险包括：政治风险、自然灾害风险和社会风险。其主要特征是具有突发性，在无法预知的情况发生，对项目产生重大影响。是什么意思？

External unforeseen risks include: political risk, the risk of natural disasters and social risks. Its main feature is the sudden, unforeseen circumstances occur, have a significant impact on the project.

External unforeseen risks include: political risk, risk of natural disasters and social risks. Its main feature is a sudden, when it is not possible to predict the occurrence of the project, have a significant impact.

The outside unpredictable risk includes: Political risk, natural disaster risk and social risk.Its main characteristic has the burst characteristics, is being unable the situation occurrence which knew in advance, has the significant influence to the project.

External unpredictable risks include: political risk, the risk of natural disasters and social risk. Its main feature is a sudden, unforeseeable happening, have significant impact on the project.

external unforeseen risks include: political risk, risk of natural disasters and social risks. Its main feature is a sudden, when it is not possible to predict the occurrence of the project, have a significant impact. ;