正如您在HTML中所看到的，以一种标准方式引用一个外部文件效果很好。
As you've seen in HTML, referring to an external file in a standardized way works well.
它阐释了为什么有时公司内部开发产品或服务比从外部购买的效果更好。
It explains why it is sometimes better for a company to develop a product or service inhouse, rather than buying it from outside.
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)。
In effect, the heterogeneity of the external systems influences multiple layers of the architecture (to be covered in the next article of this series).
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