他们已经搞清楚这个物理变化的成因。

They have cleared up the cause of the physical change.

《新英汉大辞典》

这可能会给头部带来物理变化，尤其是前额，会变大。

This is likely to bring about a physical change to the head, in particular the forehead, will grow larger.

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例如，奶酪的溶解便是一个物理变化。

For example, melted (溶解的) cheese has gone through a physical change.

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But calculating it alone doesn't necessarily tell us whether or not it will just happened of its own accord.

但是计算这些物理量并不一定能够告诉我们,这些变化是否会自发的进行,而这正是我们想要做到的。

麻省理工公开课 - 热力学与动力学课程节选

Whereas under these conditions, these quantities, if you look at free energy change, for example at constant temperature and pressure, H you can still calculate H.

但是，在这些条件下，这些物理量，如果我们考察自由能的变化,例如在恒定的温度和压强下，我们仍然可以计算。

麻省理工公开课 - 热力学与动力学课程节选

You have a diversity in the chemical changes that occur as a result of any of those connections.

又有多样化的化学变化,这是那些物理连接的产物

耶鲁公开课 - 生物医学工程探索课程节选