这里构建的DSL是一个简单的计算器语言，用于获取并计算数学表达式。
The DSL being built here is a simple calculator language, designed to take mathematical expressions and evaluate them.
数学表达式解析器，适合编写自己使用的计算器！
MathHead_E mathematical expression parser for the preparation of their own use of calculators!
数学表达式解析器，适合编写自己使用的计算器！
MathHead_E mathematical expression parser for the preparation of their own use of calculators!
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