Besides, the causes of problems in communication vary from the deficiency or irretrievability of the linguistic knowledge to the inadequacy of knowledge about the topic under discussion.

• 此外，这一定义将问题的范围从语言知识延伸到了话题知识，而问题的起因除了语言或话题知识的缺乏也包括表达时对语言知识的暂时忘却。