A subject contains many documents, but each document can only belong to one subject.
一个主题可以包含很多文档，但是每个文档只能属于一个主题。
The document object contains many of the methods that you might want to review.
文档对象包含很多需要注意的方法。
Split a document into many documents or join many documents into one
将一个文档分割成多个文档，或将多个文档组合成一个文档
How many times will a document be read in its life?
文档在使用期限内会被读取多少次？
Document management integrated system has many customers because it has good common and open attribute.
《文献管理集成系统》因其具有良好的通用性和开放性而拥有众多的用户。
Document management integrated system has many customers because it has good common and open attribute.
《文献管理集成系统》因其具有良好的通用性和开放性而拥有众多的用户。
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