变压器的耦合系数与变压器的效率有关。
The coupling coefficient of transformer relates the transforming efficiency.
实际上高输入阻抗的变压器，它们的效率和频带宽度都会下降。
At high input impedances, in practice both efficiency and bandwidth of a transformer will reduce.
例如，因为温度的不断增高，变压器可能出现较高的失效率，而某些类型的火力发电站的效能也可能会显著的降低。
For instance, transformers could suffer higher failure rates and efficiency of some types of thermal power station could be markedly reduced because of increasing temperatures.
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