| The CAD system intellectualized development had pointed out the natural language takes the man-machine interactive inevitable trend. Lead CAD system into Artificial Intelligence technology especially Nature Language Understanding technology, enable it to have expert's experience and the knowledge, has the study, the reasoning, the association and the judgment ability, as well as intellectualized vision, sense of hearing, language handling ability, thus the purpose to achieve design automation. This topic used Chinese Natural Language Understanding technology, in view of several semantic analysis method, specially Conceptual Dependency Theory and Case Grammar, carried on the scientifically study, proposed the new semantic analysis concept - comprehensive semantics. And based on this, had carried on a more thorough discussion to Chinese Structure'V+de'complex sentence classification and processing. Finally, carried on the understanding and analyzing to the user's needs that are expressed in the form of natural language, and transformed analysis result into the designing requirement of the concept or design parameter, offered a good design environment to user and designer.
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