Classic algorithms for expression evaluation.

表达式求值的经典算法。

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So with that link established, you need to get an object that can handle XPath expression evaluation.

因此，建立这种联系后，还需要获得一个能够处理XPath表达式求值的对象。

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The interactions window lets you start a debugging process through an arbitrary expression evaluation.

交互式窗口使您能够通过任意表达式评估来启动调试流程。

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