为了降低成本简化设计，面向应用要求设计了一种定制式的传感器网络系统。
In order to reduce the cost and simplify the design, a kind of customized sensors network system is designed based on the application.
数据库设计：通常，OLTP系统采用实体-联系(ER)模型和面向应用的数据库设计。
Database design: an OLTP system usually adopts an entity-relationship (ER) data model and an application -oriented database design.
然而，这些模型定义往往过于抽象或者是面向应用的解决方案，因此其框架很难被系统开发人员理解。
However, these frameworks are sometimes hard for system developers to understand because the models 'definitions are too abstract or focus on application-oriented solutions.
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