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职业健康Occupational health职业安全Occupational safety营养与保健Nutrition and health care过敏素Aller 灾难现象Catastrophic phenomena 生物体的意外释放Accidental release of organisms 雪崩Avalanches 旋风Cyclones 地震Earthquakes 环境事故Environmental accidents 流行病Epidemics 洪水Floods 飓风Hurricanes 山崩Landslides | 
