求翻译：汽轮机故障诊断的研究对于提高汽轮机运行的安全性、经济性及可靠性具有重要意义。汽轮发电机组的故障比较复杂，很难用单一的分解策略，建立精确的分解层次。在实际应用中先按照模式特征分解成机组轴系机械故障、发电机电气故障、汽轴机热力故障及其它部件故障四个子集。是什么意思？

Fault Diagnosis of Turbine is of great significance to improve the safety, economy, and reliability of the turbine running. The turbogenerator failure is relatively complex, it is difficult to establish the precise level of decomposition using a single decomposition strategy. The unit mechanical fai

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