Each rule definition contains an optional description, a list of variables, and an expression.
每个规则定义含有一个可选描述、变量列表和一个表达式。
Another important ground rule is that participation in exercises during a retrospective is optional.
另一项重要的基本规则是可选的，即在回顾中参与练习。
The submission rule is optional; you need it only if you want to submit just the data instance instead of the entire form.
提交规则是可选的；只有在希望提交数据实例而不是整个表单的情况下，才需要提交规则。
This rule states that comments are optional.
此规则声明，注释是可选的。
The very controversial Unique Particle Attribution (UPA) rule makes it difficult to use optional wildcards.
争议很大的惟一粒子属性（Unique Particle Attribution，UPA）规则不允许使用可选的通配符。
Note that though this step is optional in deploying the ruleapp to rule Execution Server (RES), it is a recommended and more systematic approach to store the RES configuration for future use.
请注意，虽然此步骤在将ruleapp规则部署到ruleExecutionServer (RES)是可选的，但是存储RES配置以备将来使用是更有系统的方法，故推荐这样做。
The optional match section of the iptables command specifies the characteristics that a packet should have to match the rule, such as source and destination address, protocol, etc.
iptables命令的可选match部分指定信息包与规则匹配所应具有的特征（如源和目的地地址、协议等）。
In fairness, this only evaluated the rule-based filters, not the optional checks against distributed blacklists.
公平而论，这只是评估基于规则的过滤器，而没有针对分布式黑名单做选择性的检查。
Another important aspect of a rule is the optional salience attribute.
规则的另一个重要的方面是可选的salience属性。
If you don't want the active rule to be reevaluated, you should include the rule's optional no-loop attribute and give it a value of true.
如果不希望这种情况发生，则应该包括rule的可选no -loop属性并将其赋值为true。
Note: This rule on cutting corners is optional.
说明：切开角的规则是可选的。
The production rule is the primary mode of the knowledge representation. The system provides optional project by reasoning, interface for user and blackboard structure. Thes...
在系统设计中采用产生式规则作为知识的主要表示方式，并通过推理、用户界面以及黑板结构向用户提供合理的候选方案。
The production rule is the primary mode of the knowledge representation. The system provides optional project by reasoning, interface for user and blackboard structure. Thes...
在系统设计中采用产生式规则作为知识的主要表示方式，并通过推理、用户界面以及黑板结构向用户提供合理的候选方案。
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