Defines an image map 图片地图
A grid of white dots defines an in situ operation, MacKay River, west of the Mildred Lake Mine and near the left edge of the image.
白点组成的格子就是麦凯河原位矿井，位于米尔德里德湖矿的西边，在下图的左边缘。
VoiceXML defines the conversation flow, and just like an HTML application has graphics and image maps, VoiceXML applications also have constructs, such as grammars and pronunciations.
VoiceXML 定义对话流，并且就象 HTML 应用程序有图形和图像映射一样，VoiceXML 应用程序也有结构，比如语法和发音。
Line 4 defines the jhuapl.edu_icon node with the attributes of no label, an invisible bounding box, and an image as the appropriate Web-page thumbnail file.
行4定义了一个jhuapl.edu _ icon节点(属性为no label)，一个不可见的边界框，以及一个用作合适的Web页面缩略图文件的图像。
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