来源于这样的情况,不同种分子之间的相互作用,不容易进行。

That came from the case where the unlike intermolecular interactions are not as favorable.

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但它们几乎都没有，和不同种分子发生相互作用。

But hardly any of them experience interactions with the unlike molecules.

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换句话说，在那种情况下，同种分子间的相互作用，比不同种分子间的，相互作用更容易进行。

In other words, the intermolecular interactions between like molecules are more favorable than the interactions between the unlike molecules, in that case.

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