How easy is it to find out what the rules are, how to comply with them and what it will cost?

查找制度内容是否方便，如何完成，以及成本如何？

youdao

In there, I want to make this distinction, this nuance: the evaluator is still going to be taking those expressions and using its rules to get a value, but it's not going to print them back out.

在这里，我想要做这么一个，细微差别：运算器依然会,对表达式,进行求值，但是不会,显示结果值。

麻省理工公开课 - 计算机科学及编程导论课程节选

It's using its set of rules to deduce the value and print them back out.

计算器用自己的规则,去计算出结果来并返回。

麻省理工公开课 - 计算机科学及编程导论课程节选