Master rule command1 contains rulerefs that show that other rules are used, major followed by minor.

主规则command1包含几个ruleref，表示使用了其他规则(前面是major，后面是minor)。

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In order to use the output of a command, command1, as input to a filter, command2, you connect the commands using the pipe operator (|).

要将命令command1的输出作为过滤器command2的输入，您需要使用管道操作符(|)连接两个命令。

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The myroot rule contains one or more rulerefs, each of which has a URI that points to another rule, in this case command1, which is the master rule for an n-gram.

myroot 规则包含一个或多个 rulerefs，每个都有一个指向另一规则（本例中是 command1，它是一个 n 元语法的 master rule）的 URI。

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