只要没有混合的类型表达式，就可以在常数说明中使用算术运算符。

You can use arithmetic operators within your constant declarations as long as there are no mixed type expressions.

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这些事件类型被定义为投递型常数，如下所示。

These event types are defined as post-type constants as follows.

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每种标志类型都用tokentype类中的一个常数表示，其中包括。

Each token type is represented by a constant in the TokenType class. Constants can include.

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