随着一天天衰老,我们的身体消耗热量的功能逐渐减弱。
As we get older, our bodies become less efficient at burning up calories.
跑步是燃烧多余热量的有效办法。
跑步是消耗多余热量的最好方法之一。
Running is one of the best ways to burn off excess calories.
What's happening there? Well, the selection of reactants has been done judiciously to provide either heat or to provide something that's cool.
就会感到这东西,比如说变冷了,对吧?,这里发生了什么?这些反应物都是,被仔细的选出来的,能够提供热量或制冷。
However, the thing to remember is, when you look at heats of reaction under those conditions it's all well and good.
相反,需要记住,当你需要知道反应中放出的热量时,这些量是很有用的。
All right, so this is the heat flowing in or out of the system, and these are all functions of state.
好的,这就是系统的热量变化,这些都是态函数。
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