At first, this thesis elaborated the internal structure of user costs and existing calculation models.

本文首先针对用户成本的内部构成和已有计算模型进行阐述。

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User costs are made up of vehicle operating costs, delay costs, costs of traffic accidents and uncomfortable running.

用户成本主要包括：车辆运营费用、延误费用、事故费用和行车不舒适性。

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The easy to use product, allows users to quickly assemble business applications and reduce the overall costs of user interface design.

该产品的易用性使得用户能够快速组合业务应用程序，减少用户界面设计的总体成本。

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They lower overall user costs to the user and to the environment, and they decrease demand on fuel, lowering costs for all everybody.

FORBES: Innovation, Consumer Reports, and the Prius: Why George Will Was Wrong

Several South American countries, such as Chile and Brazil, which introduced telecoms competition more successfully than Mexico, are seeing rapid growth in telephone lines and Internet use and falling user costs.

ECONOMIST: Costa Rica

This unwillingness and failure to segment the Chinese market has led to an ever more vicious cycle of rising user acquisition costs for startups.

FORBES: Has China's Internet Become Inhospitable To Startups?