If there were no voltage on the plates, we would expect everything to be over here in some negative value falling.

如果板子上没有速度，这些可能都在这,都是负值下降的。

麻省理工公开课 - 固态化学导论课程节选

So you're implementing this black box, and if its purpose in life is to actually return a value, you have to tell the compiler what kind of value to expect, and this is going to have ripple effects.

你在实现这个黑盒子，如果它的目的是,返回一个值，你必须告诉编译器你期望的是什么类型的值，这个将是一个连锁反应。

哈佛公开课 - 计算机科学课程节选

And in Python the expression is, operand, operator, operand, when we're doing simple expressions like this, and if I give it to the interpreter, it gives me back exactly what you'd expect, which is that value. OK?

在Python中表达式就是，运算对象，操作符，运算对象，当我们处理这样的简单表达式的时候，我把表达式传给处理器，处理器给我返回了我想要的结果，对不对？

麻省理工公开课 - 计算机科学及编程导论课程节选

So the value is z is 4, it's what I expect, right?

所以z的值等于？

麻省理工公开课 - 计算机科学及编程导论课程节选