美国的印第安人是如何使用火的？

How did Indians in America use fire?

youdao

我想到的第一个主意是用火，因为我认为狮子害怕火。

The first idea I got was to use fire, because I thought lions were scared of fire.

youdao

例如，美洲的印第安人用火制造烟雾来传递信息。

The Indians in America, for example, used fire to make smoke as a message.

youdao

Or I could have a non-adiabatic, I could take the same temperature change, by taking a flame, or a heat source and heating up my substance. So, clearly q is going to depend on the path.

也能改变温度，绝热指的是没有热传递，在非绝热条件下，也同样可以升温,比如用火或者热源加热，这样，q也应当与路径有关。

麻省理工公开课 - 热力学与动力学课程节选