In this case, I choose to declare a new element, named trext: Theft, but give it the existing type nc: ActivityType rather than define a new type.
在本例中，我选择声明一个新元素，命名为trext： Theft，但是使用现有类型nc： ActivityType，而不是定义一个新类型。
A design model of NC code complier based on ANother Tool for Language Recognition (ANTLR) was presented, which adopted the Extended Backus Naur Form (EBNF) to define the NC program syntax rule.
采用了扩展的巴科斯范式(EBNF)定义NC程序语法规则，提出了一种基于语言识别工具(ANTLR)的NC代码编译器的设计模型。
Define the deterministic similitude and fuzzy similitude of NC instructions.
并对数控指令的确定性相似和模糊性相似给出确切定义。
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