You have a very, very changing demographic situation in the American South and its political culture has to respond to that.

你可以想象,当时的美国南方,人口流动是非常厉害的,所以当时的政治文化必须做出相应的调整

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So, you need some sort of property, something you can see, something you can measure, that tells you that heat has flowed.

所以，你需要某种性质，某种你能看到，能测量的东西，它会告诉你热量发生了流动。

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Can you imagine a visualization of money flowing from one place to another place, what that looks like?

你可以想象可视化的,资金从一处流动到另一处，那看起来会是怎样的呢？

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And you can get to things like the macro-stressed insure, and energy flow in a much more robust way than you can even in an advanced course of magnetism.

所以你便可以更形象地理解,像微粒，能量流动,等概念,你甚至可以,比在高级课程更讲的程度深。

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I mean, you know the wings go, and the air runs, and then the motor on the engine and it's a miracle how it gets up there and that is the way I used to explain the Greeks, because I had no better idea.

我的意思是,你知道机翼的作用,空气的流动,还有引擎上的发动机,飞机能飞起来,是个奇迹,我就是用这种方式来解释希腊历史的,因为我也没有更好的方法了

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You need a substance and then that substance has to have a property that changes depending on the heat flow, i.e., depending on whether it's sensing that it's the same temperature or different temperature than something else.

你需要某种物质,它的某种性质,随着热量的流动而改变，也就是说,依赖于它是否感觉到它,与其他的物体处于相同的温度。

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