Setting it to true ensures that when a rule updates the knowledge in the working memory, you don't end up with rules being reevaluated and reexecuted, which could then cause an infinite recursion.

将它设为 true 可以确保当一个规则更新工作内存中的知识时，最终不会导致对规则重新求值并重新执行规则，也就不会导致无限循环。

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Left recursion is used so that the rule can be reduced after each message.

为了归约每个消息之后的规则，使用的是向左递归。

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