解决老化问题主要依靠折旧或大修费，而解决失修问题主要依靠运行管理和维修养护费。
The ageing problem is solved mainly by depending on depreciation or over haul charge, while to solve the problem of out of repair is mainly to depend on operational management and maintenance cost.
解决老化问题主要依靠折旧或大修费，而解决失修问题主要依靠运行管理和维修养护费。
The ageing problem is solved mainly by depending on depreciation or over haul charge, while to solve the problem of out of repair is mainly to depend on operational management and maintenance cost.
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