The rule shown in Listing 10 has one conditional element that references a Machine object.
清单10中显示的规则有一个引用Machine对象的条件元素。
Therefore, this rule's conditional element checks whether the value of the type property (of the Machine object) is Type1.
因此，该规则的条件元素检查（Machine对象的）type属性是否为Type1。
The conditional element evaluates the Machine instance (which is part of the knowledge) to determine whether the consequences of the rule should be executed.
条件元素对Machine实例(知识的一部分)求值，以确定是否应执行规则的结果。
The conditional element evaluates the Machine instance (which is part of the knowledge) to determine whether the consequences of the rule should be executed.
条件元素对Machine实例(知识的一部分)求值，以确定是否应执行规则的结果。
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