After doing the desired effects, you will get a set of layers that look similar to what I have here.
再做完所有效果后，你会得到一系列的图层，大概和我这里差不多。
A layer diagram lets you define the structure of an application as a set of layers or blocks with explicit dependencies.
利用层关系图，您可以将应用程序结构定义为一组带有显式依赖项的层或块。
To support these principles, the OMG has defined a specific set of layers and transformations that provide a conceptual framework and vocabulary for MDA.
为了支持这些原则，OMG 已经定义了一系列的层次和转换，他们为 MDA 提供了概念性的框架和词汇表。
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