The rule class is quite simple, typically containing only a single method.
规则类是十分简单的，典型情况下只包含一个方法。
Change the rule implementation class.
更改规则实现类。
Define the class that represents the rule.
定义代表规则的类。
Add the following lines to the top of the rule class.
向规则类的顶部添加下列代码。
The queueing system imposes an important exception to this rule with a priority class.
这个排队系统在 prioirty类（class）上增加了重要的规则。
In this case, the class attribute contains a fully qualified class path for the rule.
在这个例子中，class属性包含一个用于规则的完整的类路径。
Let's make it a rule that we mustn't speak Chinese in English class.
我们把英语课上不许讲汉语当作一条规则确定下来吧。
The teacher made it a rule to speak only English in class.
老师规定在课堂上只能讲英语。
He will Break the rule if he skips class.
如果他逃课的话他将违反校规。
He made it a rule only to speak English in class.
他规定课上只能说英语。
Class, what is the rule about asking questions?
同学们关于问问题的规矩是怎样的？
Class, what is the rule about asking questions?
同学们关于问问题的规矩是怎样的？
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