Specify the -e option and provide an expression to evaluate. Again, wrap the expression in quotation marks to prevent interpolation by the shell.
指定- e选项并提供要运算的表达式。
We put a template expression within the interpolation braces when we wrote {{1 + 1}}.
当我们写{{1 + 1}}时，是往插值表达式的括号中放进了一个模板表达式。
Engineering applications, the interpolation and regression (curve fitting) function expression usually are used to describe data to solve the problem.
工程应用中通常用插值和回归(曲线拟合)解决函数表达式描述数据的问题。
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