古典数学家相信这个数字代表了最美观的矩形的尺寸，不过它一般出现在计算数学中。
Classical mathematicians believed that this number represented the most aesthetically pleasing ratio for the dimensions of a rectangle, but it also turns up in computational mathematics.
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.
函数性语言并不执行命令，而是通过表示、计算数学函数来解决问题。
Rather than executing commands, all functional languages express and evaluate mathematical functions to solve problems. Functional languages also usually have these two characteristics.
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