This is a base class for other code expression objects that is never instantiated.

这是其他从不实例化的代码表达式对象的基类。

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Report variable is a special objects build on top of an expression.

一个报表变量是在表达式头部指定的。

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Report variable is a special objects build on top of an expression.

一个报表变量是在表达式头部指定的。

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