内容建设，是一长期积累的过程。
Content construction, it is the process that accumulates for a long time.
经验不是凭空而来的，它是一个人长期积累的结果。
Experience is not what happens to a man, it is what a man does with what happens to him.
作为生产和契约知识长期积累的结果，企业是异质的。
As a result of long-term accumulation of the knowledge of production and contract, enterprises are heterogeneous.
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