不幸的是，外部厂商在生产中犯下了太多的错误。
Unfortunately, the outside manufacturers made too many production errors.
从内部的开发项目到与外部厂商的集成项目可能引入了新的产品。
Moving from an in-house development project to an integration project with an external vendor is likely to introduce new deliverables.
为了不把整个结构和所需产品耦合在一起，通常在设计来与外部厂商代码交互的应用中包括进一个抽象层。
So as not to couple the entire architecture to the desired product, it is common to include an abstraction layer in applications designed to interface with outside vendor code.
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