该文首先指出,人们不可能建造出绝对安全的建筑物来,它们都存在一个“事故发生概率”,即使是极其微小的也罢。认识到这一点很重要,不仅建筑物损坏后,就是其安全程度显著降低也会立即带来危险和经济损失. 人们在评价安全情况时总可能犯二种不同性质的错误: 断定存在安全情况恶化的危险,但事实上它并未恶化; 断定安全情况正常而事实上它恶化了。这二种情况最终都可能使工程费用大为增加。 The article first points out that people can not build absolutely safe buildings. All of them have an “accident probability” even if they are extremely small. It is important to recognize that not only does damage to a building occur, but its risk to safety can also be immediately compromised by a significant reduction in its safety.2 There are always two different types of mistakes that people can make when evaluating safety: Determining the deteriorating security situation It has not deteriorated in fact; it is safe to assume that it has actually deteriorated. In both cases, the cost of construction may eventually increase significantly.