4.1.1 The door and frame assembly and component parts are to be fit for purpose and have a life expectancy of a minimum of 10 years without suffering from any unreasonable wear or degradation, or with the requirement for planned maintenance parts replacement such as the door gasket.的翻译：什么意思？中文翻译英文，英文翻译中文，怎么说？

4.1.1门和框架的组装和零部件要适合为目的，并没有遭受任何不合理的磨损或退化，或要求计划维修的部件，如门更换了至少10年的寿命垫片。