一个所指往往表现为话语话题或话题主体。
A referent often appears as discourse topic and topic entity.
在设备发生故障时，其故障信号往往表现为时变特性。
The fault signals always showed the characteristic of non- stationary.
复杂海量数据往往表现为多种结构特征的混合体，回归类混合模型就是对这种混合体的一个描述。
Complex and massive data usually appear as a mixture of multiple classes of structures and mixture model of regression classes is a description of such mixture.
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