该服务是一个简单的数学计算服务，提供了加法和减法运算。
This service is a simple math calculation service, providing addition and subtraction operations.
最后他们发现，当男人和女人同时做一些简单的任务，例如搜索啊、进行一些简单的数学计算啊，的时候，女人明显比男人有更好的表现。
They found that when women and men work on a number of simple tasks - such as searching for a key or doing easy maths problems - at the same time, the women significantly outperformed the men.
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.
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