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The difference between structure definition and operation definition
Different definitions and different units.

1, with different definitions. Operation definition is a method to define the meaning of variables according to the characteristics of observability, testability and operability. Structural definition means that the defined thing is a structure composed of known elements, which is different from the two definitions.

2, the unit is different. Operation definition is the smallest unit of freedom and semantic system, while structure definition unit is relatively large, and the two units are different.