The primitives of this memory are threads, defined as keyed multilink, loop-free chains, which link semantic nodes.All links run from superordinate categories to subordinate categories.

• 公司经营者的主要任务就是要去预测随著产业周期的改变，产业未来竞争环境的变化，进一步制定出合宜的竞争策略来因应产业未来的竞争态势。