After a holistic review of the development of the theories on these two types,this paper analyzes their inferential process from the pragmatic and cognitive perspectives and discusses the similarities and differences between them.

On the basis of a re-interpretation of relevance-theoretic comprehension mechanic,the author holds that the optimal relevance that the translator strives for is dynamic and relative,which is in agreement with the nature of translation,and then tries to re-interpret the mental faculty of the translator in the inferential process of translation.

The qualitative reasoning of topological relationship gradual deformation;

To realize fault diagnosis of the Switch/Relay Circuit, a method of qualitative reasoning was studied.

The principle of qualitative reasoningwas introduced firstly, and then QSIM algo-rithm was used to reason qualitatively the pro-cess of vehicles tracing caudal, finally it wassuggested that pattern matching methods can beemployed to judge the causes of a specialvehicle tracing caudal accident.

The Rational Process of the Implementing Policy of Urban Comprehensive Planning;

Since man’s rationale is limited, so in the legislative process, we should turn our attention always from the results of legislation to attention on “procedural rationale.