将用户分为三个级别，所有功能均按照级别予以限定，实现了免费信息和付费信息的管理。
The users are divided to 3 levels of authority, by which all the functions are classified and put into function. Management of free info and cost-info is realized.
这些文档中的数据可能是关于客户、雇员、产品、订购单、交货报告、付费信息或者其他是业务逻辑的一部分的业务对象的。
The data in these documents may be about customers, employees, products, purchase orders, delivery reports, billing information, or other business objects that are part of a business logic.
从第二段我们可以了解“知识付费”产业的什么信息？
What can we learn about "pay-for-knowledge" industry from Paragraph 2?
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