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It means that the properties of the system, the properties that describe the system, don't change in time or in space.
它的意思是指，用以描述系统的性质，不随时间或空间改变。
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So, these on-changing properties that describe the state of the equilibrium state of the system are called state variables.
这些描述,系统平衡态的,变化的属性,就叫做状态变量。
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We would think that Milton's contemporaries might be aghast that such a sympathetic portrait of Satan could be used at the beginning of the poem.
我们很可能以为，与弥尔顿同时代的人,看到本诗开头就对撒旦有如此具体系统的描述,定会感到惊骇。
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Here's where it comes. " The result of the discussion of these questions seems to be a general acknowledgment of the inadequacy of classical electrodynamics in describing the behavior of systems of atomic size."
这就是他来的地方“,这些问题讨论的结果,似乎变成了一种普通的知识,经典电动力学,不能描述原子尺度的系统行为“
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You could use language to describe music, talk about the--a musical language or art, or any communicative system, and there's actually nothing wrong with that.
也可用来描述音乐,即音乐语言,或是去描述艺术,或任何的交流系统,都是没问题的
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So the state variables describe the equilibrium's state and they don't care about how this state got to where it is.
状态变量,描述平衡态，它们并不关心,系统是如何演化成这样的。
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So the system will not be described by a single state variable during the path.
因此系统将不能被,路径上的单一状态变量描述。
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So what they do is, they're describing how these thermodynamic properties change, in terms of only state functions and state variables.
他们的作用是描述,随着状态函数和状态变量的变化，系统的热力性质如何变化。
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OK, any questions? All right, so we've described the system with these properties.
好，有没有问题？，好的，我们已经用这些性质描述了系统,这些性质。
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It turns out that when you're talking about macroscopic properties of matter, you don't need very many variables to describe the system completely thermodynamically.
实际上,当你谈及物质的宏观性质时，你并不需要很多变量才能从热力学上,完整地描述这个系统，’
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And so the set of properties that describes system equilibrium doesn't change.
这些描述系统的属性,平衡是不变的。
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The first thing we are going to do is describe the energy of the system.
首先我们要做的,是描述这个系统的能量。
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So, now that we've got a system, we've got to describe it.
我们现在有了一个系统，我们要去描述它，’
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If it's an equilibrium system, then thermodynamics can describe it.
如果它是个平衡系统，那么热力学就能描述它。
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So, let's describe the system now.
那么让我们现在描述这个系统。
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You're going to have to know when you describe the system, if your system is homogeneous, like your coffee with milk in it, or heterogeneous like water with an ice cube in it So heterogeneous means that you've got different phases in your system.
你要知道,当你描述一个系统时，你的系统是均匀的呢，像掺了牛奶的咖啡，那样还是非均匀的，像放了冰块的水,非均匀系统就是说,在你的系统中有不同的相存在。
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