其次详细介绍词汇链的概念、传统的构造算法。
Secondly, we describe the concepts and traditional construction algorithms of lexical chains in detail.
衔接中的词汇在长语篇中经常形成词汇链，不同的词汇链在语篇中的纽带作用不尽相同。
Lexical items often connect to form lexical chains in discourse, especially in long discourse; the cohesive strength of lexical chains in discourse is different from one another.
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