求翻译：一方面极大地提高了电厂效率，降低了成本，给水电企业带来了巨大的经济效益；但另一方面，设备一旦发生故障，所造成的损失也是不容小视的，维修费用和时间都将成倍增加。因此，在对设备可靠性提出更高要求的同时，迫切希望能有一套科学合理的诊断理论和技术，能对设备的运行状态，进行快速、准确的诊断，以保证机组不发生事故，或一旦发生事故，能限制在最小范围内。是什么意思？

On the one hand greatly improve power plant efficiency and reduce costs, has brought great economic benefits to the water and electricity companies; but on the other hand, equipment failure, caused by the loss also can not be overlooked, maintenance costs, and time will become times increase. Theref

In a significant increase in power plant efficiency, reduce costs and to water and electricity has a huge economic benefits, but on the other hand, the device in the event of a failure, the loss is not negligible, and the maintenance costs and time will be doubled. Therefore, the higher equipment re

On the one hand the earth enhanced the power plant efficiency extremely, reduced the cost, has brought the huge economic efficiency for the water and electricity enterprise; On the other hand once but, the equipment breaks down, creates the loss also does not allow to look down upon, the maintenance

Greatly improve the efficiency of a power plant on the one hand, reduce costs, and bring enormous economic benefits for hydropower enterprise; on the other hand, once the device fails, the loss was not caused by small, maintenance costs and time are multiplied. Therefore, in addition to make higher

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