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。

麻省理工公开课 - 热力学与动力学课程节选

If you were to make that change you would find that the molecule now has completely different biological and chemical properties.

如果要做出这样的变化,你会发现,分子的生物形状,和化学性质完全改变了。

麻省理工公开课 - 化学原理课程节选

And temperature then is associated with property And if it had changed, then the temperature between those two would have changed in a very particular way.

就与这种性质有关,如果它发生了改变，说明这,两者的温度,以特定的方式发生了改变。

麻省理工公开课 - 热力学与动力学课程节选

You make not small changes in their chemistry but big changes in their chemistry.

它们的化学性质,就会发生巨大的改变

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Hydrogenation is an interesting process and will bring us to the discussion of Trans fat in just a few minutes, but it's basically when you hydrogenate a food you are altering its chemical properties to take a soft fat and make it more solid.

氢化是个有趣的过程并且,一会儿我们将由它引出反式脂肪的话题,但基本上,对食物进行氢化,是在改变食物的化学性质,将软脂酸变为硬脂酸

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

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。

麻省理工公开课 - 热力学与动力学课程节选

And once he did that, both he and many other scientists, could then, once they understood what caused the fluorescence, make little changes to the actual protein, and tune what the properties of that fluorescent protein were.

而且一旦他做成了这个，一旦他们弄清楚了是什么导致萤光，他和其它很多科学家，就可以对蛋白质做微小的改变，调节蛋白质的荧光性质。

麻省理工公开课 - 化学原理课程节选

Another is how much it's processed and how if you take things that started out as food like wheat or corn, and then they're processed many different ways, and things are added to them or done to them that change their chemical properties, does that affect whether we would consider them food?

另一个是它们被加工过程和程度,比如对于用来食用的麦子和玉米,有很多种加工方式,可以向它们添加一些东西,或进行一些加工去改变它们的化学性质,这会影响我们去判断它们是否为食品吗

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

This gives you a biological mechanism for cutting, using restriction enzymes, and then you denature so that it falls apart, and then you renature so that it comes back together.

这是一种切割DNA的生物机制,用限制性内切酶,改变DNA的性质让它打开,然后让它合起来恢复它的性质

耶鲁公开课 - 生物医学工程探索课程节选