At a simple level, it is comprised of two things: first, how often does the component fail?
在一个简单的层次上，它由两部分组成：首先，一个组件多少时间失效一次？
You should then review the first four articles in this series, cited previously, which cover component design from a high level.
然后应当查阅先前引用过的本系列的前四篇文章，这几篇文章介绍了高级组件设计。
The first level consists of the performance object, which is a unit that can model a physical device or abstract component in a system.
第一级包括性能对象，它是可以为物理设备建模，或者抽象系统中组件的单元。
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