在这个例子中，我们在网格组件与面板的各个边缘之间预留5个像素，作为一个透明的边框。
In this case, we reserve five pixels as a transparent border between the grid components and each edge of the panel display.
对应用程序透明：应用程序会将RAID作为一个整体，我的文本编辑器才不会关心它加载或者保存的文件是要读写多个磁盘的。
Transparent to the application: applications using the RAID as a single device. My text editor doesn't care that the file it is saving or loading is split across many disks.
要达到这个效果，设计者们通常会创建一个容器，用一张透明的PNG图像作为其背景，并把内容放在这个容器中。
To achieve this effect, designers often create a container with a transparent PNG-image as background and place the content inside the container - with equidistant padding on all sides of the box.
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