最重要的当然是导航区顶部菜单。
The most important navigation area is of course the top menu.
记录介质具有存储至少一个导航文件的导航区。
The recording medium has a navigation area storing at least one navigation file.
例如，您可能希望测量呈现左导航区或刊头链接所花的时间。
You might want to measure the time spent rendering the left navigation or masthead links, for example.
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