信息交换与一组功能性的和非功能性的需求相关，表现出获取、传递或使用信息所受的约束的特征。
Information exchange is associated with a set of functional and non-functional requirements characterizing the constraints under which information is captured, transferred, or used.
制度本身是一种稀缺资源，好的制度具备信息、降低交易成本、激励和约束四大功能。
Institution itself is a kind of scarce resources, and a good institution has four functions: information, de-creasing exchange cost, incentive and restriction.
随着近年来手机终端的功能越来越丰富，在手机上使用移动的搜索引擎服务也成为一种不受地理位置和网络条件约束的，更简便的获得信息的方式。
Recently, more and more feature-rich mobile device come to the market, users can use the mobile search engineer to get useful information but not depend on any location and networks.
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