评估所需的属性，或进行隐含函式呼叫，就必须评估运算式。

Evaluating the expression would have required evaluating a property or making an implicit function call.

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撷取规则可以从栏位、文字、属性、标头、规则运算式和隐藏栏位中撷取。

Extraction rules can extract form fields, text, attributes, headers, regular expressions, and hidden fields.

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每个运算式内容都具有会在堆叠上置放下一个运算式内容的父属性。

Each expression context has a parent property that locates the next expression context on the stack.

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