当一个钩子执行时，它会得到从注册和执行开始到当前位置激活的探针的列表。
When a hook is executed, it gets the list of probes currently enabled for its location from the registry and executes them.
默认情况下，XPath以XML文档中的当前位置开始。
And by default, an XPath begins with your current location in an XML document.
当你知道你当前的位置无法决定你能够走多远的时候，成就的旅程就开始了。
Achievement starts when you know that your present place in life does not determine how far you will go.
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