Since 21 century the model had been improved greatly as the key variables being operated, new variables being input, and structure relationship being regulated.
21世纪以来，通过核心变量操作化、新变量引入和结构关系调整，模型获得了较大的扩展和完善。
Since 21 century the model had been improved greatly as the key variables being operated, new variables being input, and structure relationship being regulated.
21世纪以来，通过核心变量操作化、新变量引入和结构关系调整，模型获得了较大的扩展和完善。
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