结构的耐久性是结构必须满足的基本功能之一，既与设计、施工和材料等因素有关，又与使用环境和维护维修等条件有关，它直接影响结构的使用寿命。
Durability of structure is one of the basic function which structure is essential, it is closely to design, construct, material and employ environment, maintenance, it direct to effect working life.
重要功能产品的确定关系到其故障模式影响及故障规律的分析，是确定其维修工作类型和维修级别的基础。
Determination of the important functions of products related to its failure mode and effect analysis and fault laws is to ascertain the type of its maintenance work and maintenance-level basis.
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