function fragment 功能的片段
That's because you have not yet told your individual HTML fragment files how to function inside your TAB infrastructure.
这是因为您还没有告诉您的单个HTML片段文件如何在选项卡基础结构内运行。
Because you can put these probes anywhere to indicate the start and end of a operation, they can span multiple functions, or only a small fragment of a given function.
因为可以把这些探测放在任何地方以表示操作的开始和结束，所以它们可以跨多个函数，也可以只覆盖函数中的一小部分。
If you want to examine the execution across a number of functions that make up a single operation, or if you want to look at a fragment of a single function, the FBT cannot help.
如果想探测组成同一操作的多个函数，或者想检查某一函数的片段，FBT就无能为力了。
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