一条语法规则，不管如何正确，除非能懂，否则毫无用处。
You could solve this problem by regrouping all the available alternatives to a grammar rule, but manual regrouping is often error prone.解决方法是对语法规则的所有可用的替代内容进行重新分组，但是手动重新分组很容易出错。
Simply, for example, to improve the method of accepting input, you might write a grammar rule for the month so you can speak the month (see Listing 6).简单的说，例如要改进接收输入的方法，我们可以编写一个月语法规则，这样应用程序就可以直接识别月(如清单6所示)。
Its narrative language all uses high - level, its only grammar rule is an exclamation mark.它的叙事语言都用最高级, 它唯一的语法规则是惊叹号.
A grammar rule, however true ( it is ), is useless unless it can be understood.一条语法规则, 不管如何正确,除非能懂, 否则毫无用处.
