The hardwoods for door and window frames are accepted as short-lived, fifty years to a century or so, and construction is designed to make replacement easy or even unnecessary.
只有门和窗框的硬木，才使用了一些时间不长(约为50年到100年或稍长)的树木。门窗结构设计得便于更换，甚至不需要更换。
It has special unitized construction which consists of the seat, disc and stem assembly, and strainer screen all together in one unit for complete replacement maintenance.
它具有特殊的整体结构，由阀座，阀瓣和阀杆总成，以及过滤器网等整合在一个整体中，完全能够进行更换维护。
Construction companies, amid other things, will be able to attach 3d printers to drones to produce on site-replacement parts for damaged elements of houses or roads.
建筑公司以及其它机构，未来能够将3d打印机安装在无人机上，为住宅或道路现场生成替换部件。
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