To handle variable names and real values, the semantic type of Bison has to be enhanced
为了处理变量名和实际值，Bison 的语义类型必须进行增强
If a variable is used before it is initialized, a semantic error is generated, the variable is created with a value of zero, and a message is printed.
如果变量是在初始化之前使用的，那就会产生语义错误，使用值为0来创建这个变量，并打印一条消息。
Gradable antonyms are pairs of opposites with variable degrees in semantic strength.
英语层级性反义词是指语义反对但语势可变的词对。
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