例子里的第二个case，我们已经解出了元组里的值并且附给了局部变量，然后在结果表达式中使用了这些变量。

In the second case in this example, we've extracted the values inside the tuple to scoped variables, then reused these variables in the resulting expression.

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这些表达式是使用函数构成的，结合这些函数来得到我们可能要查找的结果。

These expressions are formed using functions, which are combined to get the results we may be looking for.

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这段代码是程序基本结构的一个例子，我们称之为表示计算结果的表达式。

This piece of the code is an example of an essential programming construct called an expression that represents the result of computation.

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Literally, return the control from this function, and take the value of the next expression, and return that as the value of the whole computation.

正如字面意义上说的，从这个函数返回，然后取得下一个表达式的值,并把这个值作为整个计算的结果返回。

麻省理工公开课 - 计算机科学及编程导论课程节选

What I have now is the following: I can write expressions, do combinations of things to get out values, I can store them away, I can print them up.

我已经讲过如下内容：,如何写表达式，如果把东西混合然后得到结果值，我可以将其保存，也可以将其显示。

麻省理工公开课 - 计算机科学及编程导论课程节选

And this puzzle piece here colored in blue because it's a Boolean expression is just something that--whose answer is either a yes or no, 0 true or false, one or zero.

这个拼图染成蓝色,因为它是布尔表达式,它的结果只可能是肯定或否定，对或错，1或者。

哈佛公开课 - 计算机科学课程节选