一旦将内容片断（比如文件）拖拽到导航视图后，您就可以开始预览定制的信息中心了。

You can start previewing your custom information center as soon as you drag and drop one piece of content, such as a file, into the navigation view.

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在编写配置文件时，变量都以百分比符号(%)开始，表示未知的信息。

Variables begin with a percent symbol (%) and stand in for information that can't be known when the configuration file was written.

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在开始一项测试之前，应该先指定创建文件的信息，并且初始化performancelogger INSTANCE。

Prior to starting a test, the information for creating the file should be specified and the PerformanceLogger INSTANCE initialized. The initialization code might look like this.

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