No knowledge of SQL is required to develop the other application layers.
开发其他应用程序层时，不需要SQL 方面的知识。
You should refactor the code to separate the various application layers.
应当重构代码以分离各个应用层。
Together these four layers contain the components that represent the complete enterprise application.
这4个层共同包含了表示完整的企业应用程序的组件。
The application comprises three major layers, shown in Figure 1.
这个应用程序包含3个主要的层，如图1所示。
The main layers and building blocks of the application are shown in Figure 1.
关于这个应用程序的主要架构层和构建块，请参见图1。
In complex applications, there are often multiple layers of application software as well.
在复杂的应用程序中，也存在多种应用程序层。
A network has three layers of components: application software, network software, and network hardware.
一个网络有三层组成：应用软件，网络软件，网络硬件。
Depending on the application type, multiple layers may be located on the device itself.
基于应用的类型，不同的层位于设备本身内部。
Depending on the application type, multiple layers may be located on the device itself.
基于应用的类型，不同的层位于设备本身内部。
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