Maybe you're not looking at a reaction, but you've got some new compound, and you're looking at it go from liquid to solid or to gas.
也许你研究的不是一个反应,但你得到了一种新的化合物,你看着它从液体变成了固体或气体。
麻省理工公开课 - 热力学与动力学课程节选
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