昂贵的备用发电机零件需要数月才能更换，电力公司往往不会保有大量这些零件。
Power companies tend not to keep many spares of expensive generator parts, which can take months to replace.
之后便是更换了内核和大幅改写结构的Windows 2000出场，而这种根本上的改变就意味着对于新硬件的要求和对于大量外设和软件的不兼容。
Then came Windows 2000, replacing the OS kernel and much of the architecture, which meant it needed newer hardware and was incompatible with many peripherals and applications.
负荷管理系统的逐户现场固化编程或更换程序芯片的传统升级方式须耗费大量人力、物力及时间。
The traditional upgrading way of progressive spot setting programme or changing program chip about load management system needs large manpower, material resources and time.
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