第四章是选词模型的算法实现，包括对基于模糊语义模式匹配的选词算法以及基于实例比较和统计的选词语算法的介绍。
Chapter Four describes the algorithms of the lexical selection model, including the algorithm basing on fuzzy semantics patterns and the algorithm basing on examples.
讨论了计算直觉模糊集语义匹配度的若干途径，包括贴近度、语义距离、相似度、复合条件的匹配等。
All kinds of approaches to computing the semantic matching degree on IFS, including those of near compactness, semantic distance, similarity and compound conditions match, are discussed.
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