形成这种局面的主要原因是生产用数控机床价格昂贵，操作使用和维修费用高，难以用作教学培训设备。

There are few practice and operation training in NC course because of the high cost of the NC machine and the operation and the maintenance.

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就室内设计来说，使用经过检验的家具，纺织品和设备就能大大降低维修费用。

In the interior design, the use of furniture, fabrics and equipment that have been tested can sharply cut maintenance cost.

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只要在设备的使用过程中注意收集设备的故障时间、故障间隔时间和维修费用，就可以确定出设备的最佳使用寿命。

As long as the data of failure time, failure time interval and maintaining cost are collected in operation of equipment, the optimal service life of equipment can be determined.

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