Table 3 shows the relationship between the characteristics of feature in knowledge node and the number of knowledge nodes which are relevant to the sentence.
in order to solve these problems, it is necessary to enhance the use of sentence features while dealing with the similarity judgment with knowledge nodes, the methods are as follows: Only to extract the keywords in the input sentence, that is, just find out the words exists in F, the set of knowledge feature, and remove the words which is not feature as stop words.