既然一个事件表达了过去发生的事情，他可以被认为是一个事实的阐述并且可以被系统的其他部分用来做决定的依据。
Since an event represents something in the past, it can be considered a statement of fact and used to take decisions in other parts of the system.
依据理论与实践相结合的原则，阐述中央空调水系统的常见问题及其相应处理措施，为维护管理人员提供一些实际经验。
Combining theory with practice, expounds the common issues and handling measures for central air conditioning water system, and provides some practical experience for operating and managing personnel.
并以这一结论为依据，阐述了农业技术师范院校的课程体系建设。
Moreover, the paper expounds construction of course systems of agrotechnical teachers colleges or universities, according to the conclusion gained.
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