The primary objective of UXD is to identify what will make the application most useful for the intended customer base and including that knowledge as part of the design.
UXD的主要目的是，确定哪些特性会让应用程序对于目标客户最有价值，并在设计中融入这些知识。
Engineering science majors design their own programs, building a broad base of knowledge in math and science.
工程学专业设计自己的项目，建立了广泛的数学和科学知识基础。
Finally, the thesis develops expert system of engine fault diagnosis, and introduces setting-up and maintenance of knowledge base, design of reasoning mechanism and so on in detail.
最后，课题对发动机故障诊断专家系统进行了开发，并详细介绍了知识库的建立和维护、推理机制的设计等。
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