The reason is that the condition for firing Rule 2 that was once true is not true anymore because it references an object (objectB) that is no longer part of the knowledge.
原因在于曾经为真值的用于启动 Rule 2 的条件不再为真，因为它引用了一个不再是知识的一部分的对象（objectB）。
The rule firing count performance counter could not be updated.
无法更新规则触发计数性能计数器。
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