(1)自然力造成的损失
指由自然界中常见的破坏性力量所造成的损失。

(2)突发性损失
指突发、异常、意外的事件或行为带来的损害，与渐变、磨损、损耗等情形相区别。

• United States Homeopathic Pharmacopoeia
• United States judge
• United States Magistrates
• United States Marshal
• United States of America
• United States of America law
• United States officer
• United States Reports
• United States Revised Statutes
• United States Ship
• United States Statutes at Large
• United States Supreme Court
• United States Tariff Commission
• United States Tax Court
• United States Temporary Emergency Court of Appeals
• unit investment trust
• unit of production
• unit-price contract
• unit rule
• unitrust
• unit trust
• unity
• unity of husband and wife
• unity of interest
• unity of ownership