例如，您可以创建一个复杂的部署拓扑图，在不同的层上管理复杂的关系，或者您可以使用层来显示一种设计方案随着时间的变化。

For instance, you can create a complex deployment topology but manage complex relationships in different layers, or you can use the layers to show how a design might change over time.

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罗克，明知那个项目在图希的控制之下，也知道冠以他的名字的设计不会被任何人接受，于是同意设计这个项目，前提是他的方案必须准确的按设计图纸建造。

Roark, knowing that the project is under Toohey's control, and that a plan under his own name would never be accepted, agrees, on the condition that his plan be built precisely as designed.

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图1所展示的设计保证了高度灵活的解决方案，它使您可以不用改变契约实现或者应用程序代码就可以应用或者删除契约。

The design illustrated in Figure 1 guarantees a highly flexible solution that lets you apply and remove contracts without changing either the contract implementation or the application code.

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