“表达实体”和“内容实体”是语符理论四个层次中的基点和顶点，也是交际的起源点和目标点。

Expression substance and content substance are the origin and target in communication as well as the starting point and ending point in the four levels of language coding theory.

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关联规则是一种十分简单却功能强大的、描述数据集的规则，这是因为关联规则表达了哪些实体能同时发生。

Association rules are a very simple but powerful formalism for rules that describe datasets because they express which entities can occur simultaneously with each other.

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