Because component tests deal with multiple layers of an architecture, they often deal with databases, file systems, network elements, etc.
由于组件测试处理一个架构的多个层次，所以它们经常用于处理数据库、文件系统、网络元素等。
In effect, the heterogeneity of the external systems influences multiple layers of the architecture (to be covered in the next article of this series).
从效果而言，外部系统的异构影响着体系结构的多个层(将在本系列下一篇文章中讨论)。
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