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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。
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in which the three parts of the city and the three parts of the soul are direct expressions of one another.
是一种城市的三个阶级,与灵魂的三个部份,彼此直接呼应的和谐状态。
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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。
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And as an introduction to faces I have a brief film clip from Paul Ekman, who is one of the world's great scholars in the study of facial expressions.
作为对脸的简介,我播放保罗，艾克曼的短片，他是伟大的学者,对面部表情很有研究。
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Any questions about going through these cycles and using expressions like this and so forth? Expressions like this you know turn up in various places, like in the equations sheet that appears at the end of exams, right?
关于推导这些循环和使用,这样的表达式之类的,有没有什么问题？,这样的表达式在各种地方都会出现,比如试卷后面的公式页？
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What I'm doing, by the way, here is I'm simply typing in expressions to that interpreter.
顺路说一下，我正在做的就是给计算器传入,一个表达式。
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Syntax basically says, what are the legal expressions in this language?
语法也就是说，这个语言的合理表示是什么？
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All right? And if you want to do other things, whoops, sorry-- and add them together, we will get out, again, a concatenation of that string. And these will, we'll let you work through the variations, but these are the simple expressions we can use.
对不对？如果你想要进行一些别的操作，哦，对不起-是加到一块，然后结果值也是，两个字符串的链接，这些会，我们会让大家慢慢学习变量，但是这些是我们能用的最简单的表达式。
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First, I want to talk a little bit about facial expressions, which are ways in which we communicate our emotions not the only way, but an important way and look, in particular, at the case of smiling because it's kind of interesting.
首先，我要讲一点面部表情，这是我们在情感中的交流方式,不是唯一方式，但是重要的方式,看，特别是，拿微笑为例,这有点有趣。
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Which is, and we're going to do some examples of this, initially we just typed in expressions Python into the interpreter; that is,directly into Python And as I suggested last time, the interpreter is actually a program inside of the machine that is basically following the rules we're describing here to deduce the value and print it up.
也就是，我们将会对这一点讲解一些例子，一开始我们只是简单的把表达式输入,到解释器里面去，也就是直接传给,我上次跟大家讲过，解释器实际上是,机器内置的,按照我们描述的规则,来推算出结果值并把值显示出来的一个东西。
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Most of the time, we're going to be doing expressions inside of some piece of code, inside of a script, which is the Python word for program.
大多数情况下，我们会在一些代码内部,写一些表达式，在一个脚本里面，也就是Python里面对程序的另一种叫法。
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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？
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So. Starting with the shell, I can type in expressions.
好，从sell开始，我可以输入一些表达式。
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