只有解决信息非对称问题，才能真正满足用户的文献需求。
On when the problem of non-symmetry is solved can library meet the documentation and information demand of the users.
协同服务是数字图书馆的灵魂，是解决用户边际文献需求最有效的途径。
The collaborative service is the soul of digital library and is also the most effective way to solve the user's demand for marginal collection.
读者服务是指图书馆根据读者的文献需求，充分利用图书馆资源直接为读者提供文献和信息服务的一系列活动。
Readers service refers to a series of activities which are directly provided by the library. The library resources include documents and information services.
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